i had both, my S75 cracked. they both have the same cover, an S75 if you guys dont know 900's cover system, the only difference between them is the core. if i remember right i "THINK" by the numbers the bounty would move just a little more.
i didnt have them drilled the same so i cant tell you how much but both are great balls. i love my bounty and dont forget about the original break series either, i am still throwing my break pearl since day one and recently invested in another one