23 to 18 spline what it takes and how good i'll be!

Well i have owned before the 18 spline 833 and got no problems at all with it my question comes cuz i didnt know how strong is the 23 spline 833's and as far as i see here it is almost up to par with the 18 spline i think the only diference is the imput shaft size and ratios but thats about it IMO, did someone got more imput? i think i'll be ok with the 23 spline b-body 833 i get, taking in consideration that it is going to be in a lighter car than the B body 383 b engine it came with, i think it should be ok!