The neck on the trem is a touch rougher, unlike the stoptail which is like silk. The stoptail's neck feels a touch larger too. I need to do a setup tweak on the trem as the action is a bit too low for me, and the bridge isn't floating as I like. I'll sort that out in a bit, won't take long to do.
Tonally, the trem is a touch more open and bright although it does have fresh strings. Very similar ballpark though, not a huge amount in it, which is good as I like the tone of the stoptail!