2001 GSXR rear rim on a 2006 BUSA will it work?


I have a 2006 Busa that I've been redoing since my wreck on it a year ago. The question that I have is this, a friend of mine gave me some rims that he said will work on my busa off of a 2001 GSXR-1000. We measured the front and the back and the front fit fine. The back on the other hand did not. The bearing are smaller on the outside measurements on the 1000 but the inside is the same. We also measured the shaft and they are identical. So it should work shouldn't it?
You may need to have some spacers made. Also the the rear brake maybe a prob.