I'm not positive but I doubt that polaris gears will fit on a cat driveshaft. I know the drive shafts are pretty different. I have some gears off an 04 king. i'm not sure if they will work but you can let me know if you'd like them for cheap.
good luck
BigTwin is right, the shaft splines are different. There are a couple places around that make Hyvo gears to fit the cat shafts though, if you want to go that route. The gears from his King Cat will fit your shafts, if the gearing ratio is something you could live with.