R31 weighs more than R32 too..
it's almost in the R33 gtst weight.
also, red top RB20 is crap compared to silvertop.
R32 has the better brakes to begin with.
Not sure on DIFF differences between the 2.
so, the R32 is lighter, newer, better suspension, more power, better brakes at minimum.
but you know.. feel free to go for the wedge.
there is a following for them.
I was about to buy one that had a silver top and mods already done for about $6K, but an R31 loving freak on here talked me out of it.