I can't remember what year they changed it but, there are two designs of cam gear. The later one is a two piece that has 0 lash. The size and tooth pitch are the same though.
All that 2 piece gear is for is a dampening system, I believe. You can use either one if you choose so why can't you use either cp3 gear? I would agree they are the same gear aswell.
last one I saw they were different At least between an lly and an lbz. Or the gear did not sit as close to the pump on the lbz.
x2 the lbz i had the gear sat out a little farther from pump.. and i could not get it to roll in with the y bridge in.. swapped gears rolled right in.. but tooth count was the same.. but i guess i figured id just swap them.