I actually learnt how to kite on the snow before the water...... picture me getting body dragged, sliding up and down a mountain with rocks, fences, hills and all sorts of other dangerous s*ht lying around.
Snowkiting is a completely different experience in my opinoin. Yes, the mechanics are the same, but you need to factor in wind shade between hills, kite looping to get up hill, tack lines (completely different if you want to get anywhere).
It's more of a cross country challenge rather than just mowing the lawn, but, you can do that too if you want.
You also need a raft of new gear - a foil kite, board/boots/gloves/jackets for the cold etc.
I think Chasta sums up snowkiting pretty well (i've met him in person, awesome dude):