Yeah...
Um...
Well, the new rollers will fit, they're smaller than stock but...
I'd guess you'd have two main problems.
First would be a vibration/rattle. The smaller size would mean they have more room to bounce around.
My other guess would be that they would wear out faster, but that's just a guess.
I think the new, more rounded, weights would act smoother than your stocks due to no flat spots.