What esle differs from the VOTC stormie, besides the obvious?
Even though I don't have the VOTC Stormie in front of me at the moment, I can tell you the most obvious differences I've noticed in the sculpt off the top of my head:
-There is no waist articulation at all on the Evo Sandtrooper
-The hands are sculpted differently on the Evo Sandtrooper
-There is a hole/slot in the back of the torso for the backpack
-The belt is different (it has a pocket thing on the hip as opposed to the holster on the VOTC Stormtrooper, which is totally absent on the Sandtrooper)
Those are the most obvious things I could see, going by memory. I want to say that the Sandtrooper's head is a different sculpt, but I can't say for sure. It could have something to do with the rather short neck-ball and pauldron, but it just looks smaller this time around to me.