You say you thought there was something with it, do you still think that? Have you tried something different if it doesn't move? Try disconnecting the rod end at the bell crank and see if the steering is free.
Your difficulty and the comparison between the two machines may be strictly in the ski profile. Polaris skis basically had a flat profile on the bottom until they came out with a rocker style in 96 or 97 that allowed ski to turn much more easily while sitting or moving. I'll bet your 500 has a flat profile.