Do I gotta go and dig up the quote where Blizzard talked about the sandfury skin and mentioned it was non-canon but if you wanted to muck around with it, go nuts?
They don't look vastly different. We've seen Sandfury trolls for over 20 years in this game and every single time they've shown up they're just tan jungle trolls. They don't even use the bulkier models. The big fancy boss one of them in Throne of Thunder, when they updated other trolls to be fancy, is just a redo of the male troll model. Their Hearthstone appearances are clearly inspired by these. If Sandfury trolls were supposed to look so, so very different, then why has every single artwork and portrayal of them for the past 20 years just matched what they look like ingame, which is to say: Tan jungle trolls?