I expect the differences between Xenos and RSX to matter in XB360>>PS3 ports where the features of Xenos are used effectively and RSX hasn't got those features, but going the other way round what has RSX got that Xenos hasn't that makes porting assets hard so that they'd be downgraded?
Why would anyone need to port from 360 to PS3? Or PS3 to 360?
High-quality multiplatform games have their own devteams for both versions. Even EA said 360 <-> PS3 does not give good results.
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