I need a confirmation on following:

MINI OEM 17" rims:

R91, star bullets ( introduced with first generation convertibles) and

R111, black star bullets (introduced with second generation convertibles and now available for all models)

Are those the same specs wheels? I would say they look 95% identical in design. I just need to know if the "numbers" are the same for both rims. I know for a fact that R111 can fit over JCW BBKs for second generation (even MINI never included this rim in "official" BBK list...), but need to confirm that R91 can do the same, as I am looking for extra set of rims for winter and found a used set of R91...