Taken from
http://system-zero.com/sales/nov/500.html
Cross platform game sales for XBox/GCN in Top 500:
XBX MORTAL KOMBAT: DEADLY NOV'02 MIDWAY 104,155 104,155 $48.88 $5,091,133.27
GCN MORTAL KOMBAT: DEADLY NOV'02 MIDWAY 38,169 38,169 $48.74 $1,860,447.94
XBX MEDAL HONOR FRONTLINE NOV'02 ELECTRONIC ARTS 96,885 96,885 $49.68 $4,813,521.28
GCN MEDAL HONOR FRONTLINE NOV'02 ELECTRONIC ARTS 34,864 34,864 $49.71 $1,732,912.41
GCN HARRY POTTER: CHAMBER NOV'02 ELECTRONIC ARTS 83,998 83,998 $49.24 $4,136,003.99
XBX HARRY POTTER: CHAMBER NOV'02 ELECTRONIC ARTS 37,521 37,521 $49.38 $1,852,658.28
XBX TONY HAWKS PRO SKATR4 OCT'02 ACTIVISION 55,749 91,320 $47.58 $2,652,589.47
GCN TONY HAWKS PRO SKATR4 OCT'02 ACTIVISION 45,057 66,852 $49.33 $2,222,654.44
XBX BOND 007: NIGHTFIRE NOV'02 ELECTRONIC ARTS 53,279 53,279 $49.54 $2,639,535.84
GCN BOND 007: NIGHTFIRE NOV'02 ELECTRONIC ARTS 49,897 49,897 $49.51 $2,470,139.53
XBX MADDEN NFL 2003 AUG'02 ELECTRONIC ARTS 45,865 292,269 $47.14 $2,162,184.17
GCN MADDEN NFL 2003 AUG'02 ELECTRONIC ARTS 28,989 112,889 $38.80 $1,124,747.44
XBX SPIDER-MAN: THE MOVIE APR'02 ACTIVISION 41,543 391,849 $39.10 $1,624,342.29
GCN SPIDER-MAN: THE MOVIE APR'02 ACTIVISION 20,751 300,088 $47.10 $977,311.18
XBX TIGER WOODS PGA 2003 OCT'02 ELECTRONIC ARTS 39,054 51,858 $49.62 $1,937,766.24
GCN TIGER WOODS PGA 2003 OCT'02 ELECTRONIC ARTS 10,939 13,557 $46.91 $513,134.65
XBX SW: JEDI KNIGHT II NOV'02 LUCASARTS ENTERTAINMENT 33,189 33,189 $51.13 $1,696,787.08
GCN SW: JEDI KNIGHT II NOV'02 LUCASARTS ENTERTAINMENT 18,355 18,355 $51.00 $936,062.55
XBX NBA LIVE 2003 OCT'02 ELECTRONIC ARTS 30,417 84,106 $49.48 $1,505,046.47
GCN NBA LIVE 2003 OCT'02 ELECTRONIC ARTS 13,549 27,263 $46.83 $634,463.24
XBX TIMESPLITTERS 2 OCT'02 EIDOS INTERACTIVE 30,174 91,583 $49.56 $1,495,507.75
GCN TIMESPLITTERS 2 OCT'02 EIDOS INTERACTIVE 23,801 63,546 $49.52 $1,178,704.54
XBX NFL 2K3 AUG'02 SEGA OF AMERICA 22,113 117,197 $31.69 $700,802.48
GCN NFL 2K3 AUG'02 SEGA OF AMERICA 6,025 24,289 $32.39 $195,123.20
XBX NBA 2K3 OCT'02 SEGA OF AMERICA 21,234 75,101 $49.43 $1,049,643.39
GCN NBA 2K3 OCT'02 SEGA OF AMERICA 5,246 13,213 $49.52 $259,799.29
XBX FIFA SOCCER 2003 NOV'02 ELECTRONIC ARTS 20,326 20,326 $49.64 $1,009,060.05
GCN FIFA SOCCER 2003 NOV'02 ELECTRONIC ARTS 8,125 8,125 $46.95 $381,471.04
XBX NEED SPEED: PURSUIT 2 SEP'02 ELECTRONIC ARTS 20,171 68,990 $49.41 $996,574.18
GCN NEED SPEED: PURSUIT 2 SEP'02 ELECTRONIC ARTS 19,496 44,570 $49.40 $963,075.28
XBX NCAA FOOTBALL 2003 JUL'02 ELECTRONIC ARTS 19,167 183,216 $46.81 $897,131.76
GCN NCAA FOOTBALL 2003 JUL'02 ELECTRONIC ARTS 14,195 64,135 $32.30 $458,507.33
XBX NAMCO MUSEUM OCT'02 NAMCO 17,904 31,408 $30.43 $544,784.87
GCN NAMCO MUSEUM OCT'02 NAMCO 11,457 18,237 $29.51 $338,129.42
GCN BOND:AGENT UNDER FIRE MAR'02 ELECTRONIC ARTS 16,445 275,728 $29.78 $489,749.84
XBX BOND:AGENT UNDER FIRE MAR'02 ELECTRONIC ARTS 14,136 251,713 $29.76 $420,732.06
XBX NICKELODN PARTY BLAST OCT'02 INFOGRAMES 13,616 14,462 $30.45 $414,570.03
GCN NICKELODN PARTY BLAST NOV'02 INFOGRAMES 7,553 7,553 $42.66 $322,252.69
GCN CRASH BANDICOOT:CORTX SEP'02 VIVENDI UNIVERSAL 12,728 23,720 $46.21 $588,136.34
XBX CRASH BANDICOOT:CORTX APR'02 VIVENDI UNIVERSAL 8,114 83,778 $29.72 $241,122.90
GCN TY TASMANIAN TIGER OCT'02 ELECTRONIC ARTS 12,506 21,148 $33.81 $422,853.70
XBX TY TASMANIAN TIGER OCT'02 ELECTRONIC ARTS 11,873 18,936 $31.09 $369,147.00
XBX NASCAR THUNDER 2003 SEP'02 ELECTRONIC ARTS 11,989 42,641 $49.43 $592,561.96
GCN NASCAR THUNDER 2003 SEP'02 ELECTRONIC ARTS 8,418 21,459 $47.13 $396,749.68
XBX NHL 2003 OCT'02 ELECTRONIC ARTS 11,044 32,529 $49.50 $546,715.50
GCN NHL 2003 SEP'02 ELECTRONIC ARTS 5,518 13,930 $47.06 $259,671.38
GCN SSX TRICKY NOV'01 ELECTRONIC ARTS 9,969 172,853 $19.52 $194,564.12
XBX SSX TRICKY DEC'01 ELECTRONIC ARTS 6,089 128,491 $19.68 $119,847.43
XBX NFL BLITZ 2003 AUG'02 MIDWAY 9,596 29,288 $37.53 $360,164.02
GCN NFL BLITZ 2003 AUG'02 MIDWAY 7,460 21,517 $38.25 $285,356.58
XBX BLOODRAYNE OCT'02 MAJESCO 9,516 28,611 $49.05 $466,709.45
GCN BLOODRAYNE OCT'02 MAJESCO 4,866 11,407 $49.51 $240,897.63
XBX X-MEN: NEXT DIMENSION OCT'02 ACTIVISION 9,503 13,488 $50.51 $480,048.48
GCN X-MEN: NEXT DIMENSION OCT'02 ACTIVISION 7,692 15,748 $46.63 $358,682.29
XBX TETRIS WORLDS JUN'02 THQ 8,870 66,539 $30.13 $267,219.44
GCN TETRIS WORLDS JUN'02 THQ 5,870 34,521 $36.64 $215,066.47
XBX TUROK: EVOLUTION AUG'02 ACCLAIM ENTERTAINMENT 8,727 111,145 $33.45 $291,946.37
GCN TUROK: EVOLUTION AUG'02 ACCLAIM ENTERTAINMENT 7,386 63,838 $32.18 $237,730.15
XBX PAC-MAN WORLD 2 OCT'02 NAMCO 7,576 9,945 $31.15 $236,017.66
GCN PAC-MAN WORLD 2 MAR'02 NAMCO 4,884 78,339 $30.94 $151,119.82
GCN ROBOTECH: BATTLECRY OCT'02 TDK MEDIACTIVE 7,341 22,575 $49.50 $363,413.80
XBX ROBOTECH: BATTLECRY SEP'02 TDK MEDIACTIVE 6,130 40,268 $34.19 $209,589.34
GCN SHREK EXTRA LARGE OCT'02 TDK MEDIACTIVE 7,028 7,426 $45.73 $321,386.45
XBX SHREK SUPER PARTY NOV'02 TDK MEDIACTIVE 6,916 6,916 $37.59 $259,962.47 (Not multi-platform I know, but close enough)
GCN T. HAWKS PRO SKATER 3 NOV'01 ACTIVISION 5,223 379,023 $30.11 $157,256.00
XBX TONY HAWKS PRO SKATR3 MAR'02 ACTIVISION 5,051 127,432 $30.03 $151,678.79
Games I thought might be multi-platform but couldn't find a match in top 500 for:
GCN SCOOBY-DOO:100 FRIGHT SEP'02 THQ 46,588 62,285 $38.88 $1,811,157.39
GCN STAR WARS: CLONE WARS OCT'02 LUCASARTS ENTERTAINMENT 46,096 59,656 $49.28 $2,271,629.16
XBX LORD OF THE RINGS SEP'02 VIVENDI UNIVERSAL 22,725 92,082 $48.84 $1,109,970.42
GCN SPYRO:ENTER DRAGONFLY NOV'02 UNIVERSAL INTERACTIVE 19,079 19,079 $48.88 $932,620.34
XBX BMX XXX NOV'02 ACCLAIM ENTERTAINMENT 18,205 18,205 $51.68 $940,816.36
GCN MONSTERS, INC: ARENA SEP'02 THQ 13,104 25,918 $37.95 $497,344.50
XBX NHL 2K3 NOV'02 SEGA OF AMERICA 13,007 13,007 $49.70 $646,382.76
XBX NCAA FOOTBALL 2K3 AUG'02 SEGA OF AMERICA 8,361 28,344 $30.21 $252,592.38
GCN FREEKSTYLE SEP'02 ELECTRONIC ARTS 7,552 15,078 $19.80 $149,498.95
GCN MADDEN NFL 2002 NOV'01 ELECTRONIC ARTS 6,418 309,674 $16.39 $105,191.22
GCN MLB SLUGFEST 20-03 SEP'02 MIDWAY 6,366 21,933 $39.22 $249,661.66
GCN RAYMAN ARENA SEP'02 UBISOFT 6,048 9,206 $23.39 $141,461.12
XBX TERMINATOR
AWN FATE SEP'02 INFOGRAMES 6,043 27,052 $31.28 $189,044.04
GCN SIMPSONS: ROAD RAGE DEC'01 ELECTRONIC ARTS 6,013 139,072 $26.46 $159,103.29
GCN TARZAN UNTAMED NOV'01 UBISOFT 5,519 78,557 $19.55 $107,904.60
GCN BATMAN VENGEANCE NOV'01 UBISOFT 5,336 110,156 $19.49 $103,993.48
XBX THE THING SEP'02 UNIVERSAL INTERACTIVE 5,175 62,108 $43.55 $225,408.25
I think I got just about all of them. Some of these I'm not sure if they were released on the other platform or not, but their matches weren't in the top 500 as far as I could see.
This also doesn't really take into account differences in release dates which could make a difference if both were released in Nov, one two weeks after another, or if the title has been available on one console for several months and is at the end of its money making time and on the other it is just bursting onto the scene.
Overall, I think that for the most part, (excluding sports that is), the X box and GC stayed fairly close to one another, or at least with respect to their userbases. Couple of standouts with MK and MOH and Harry Potter but other than that pretty close.
Christ this took a long time to pull together.