After installing Bruteforce I was able to open the MC02 in the Dynasty & Generic editors, as expected, but just popping that into a 360 save doesn't work.
The PS3 MC02 is about half the size of the 360's (~4MB vs. ~8MB), so there's presumably other info in there that the 360 needs to read the save file. My best bet might be exporting/importing everything to a fresh 360 save, but I haven't had a chance to even try that.
Have you been using the Generic editor or the Dynasty one? And if the Generic one, which XML config file are you using?