But yeah, pretty much basically a TIE Pilot in white.

I wonder why they didn't have them wear gunner helmets like in the DS instead lol.

Searching through Wookieepedia, I found this AT-AT pilot


Do we have to wear that when piloting an AT-AT?

Basic differences:
Sandys - pauldron, different knee armour, big black backpacks, black pouches on armour, dirty, older model armour (first production armour, slightly different to later (in the movie and sequels) armour )

They wore different colored arm thingies.

In that pic the guy with binocs has a white one I think? And the other two's are black it seems.

Arm thingies? What color was it?
lol
I hope you don't mean pauldrons? Cos S-K mention those already

EDIT:
taken from: http://starwars.wikia.com/wiki/Sandtrooper
Sandtroopers wore colored pauldrons as a designation of rank. A sandtrooper sergeant's pauldron was white, while an enlisted trooper's pauldron was all black. Squad leaders, who led units of seven troopers, wore orange shoulder pauldrons

In that pic the guy with binocs has a white one I think? And the other two's are black it seems.

Sand Troopers had backpacks, and there is a black padded area below their necks. Stormtroopers don't.

They already are Sandtroopers on the Tatooine maps.

I thought i was mistaken. didn't seem like something you would miss.

Edit: Only complaint I have is that they're not full of dirt and sand like in the movies. But then again, they have just disembarked their troop ships, at least on Mos Espa, so I guess that on that map, dirt wouldn't make much sense. Edit: Come to think of it, maybe the Rebels on Mos Entha could also slightly bloodied and tattered clothing, having just been in a corvette crash.