The RFT images I saw were them in a red shirt I believe... More or less the same character, red shirt...
I've seen McEndor Troopers, McHoth Troopers, and McEndor Briefing Rebels too though...
Definitely seen unique Hoth and Endor Rebels, but not terribly unique to the final design. Could be any of those. I'd guess Hoth since they're doing a Snowtrooper but that's just a random guess too.