I wasn't testing winds very much, but there are surely more differences. I noticed that Wind Left is somehow able to make player travel through a wall, while Wind Right with exactly the same parameter cause player to get stuck next to it. Some time after joining J2O I sent a level which was showing this (I think I used parameter 32), but later I deleted it because I decided there's no point in it. Mike or some other J2O admin can eventually find it, upload somewhere and link it here.