Since no one else has responded.
I don't honestly know, but I would be ver ysurprised if Nvidia and ATI tiled textures in exactly the same way.
NVidia have at least traditionally seperated the concepts of swizzling and tiling, the first refering to a bit mangle operation that changes texture addressing for cache coherency, the latter reffering to a memory organisation optimised for render targets. They do however support rendering from tiled textures, it is however less efficient than rendering from a swizzled texture.
ATI talks about tiling in both contexts, so my assumption is that it's the same memory arrangement, and likely different to NVidias because it's optimised for different cases.
Xbox DS are usually very helpfull in these cases.
