What game have you EVER seen where the concept art is the same as what actually makes it into the game?
While there may certainly be changes between concept art and actual in-game models, you can usually see that the ingame models are based on the concept art, seeing as that's sort of what concept art is for, but here, I'm not really seeing much resemblance, though to be fair, the image is fairly small and looks a little dark, and for that reason, I can't really be certain if it's supposed to be the same armor or not. And also because of that, I'm reserving judgement on the orcish armor until we've seen a clearer image of it, or even better, an in-game screenshot that is confirmed to be orcish armor. For the orc picture, we must keep in mind here that orcs don't necessarily have to wear orcish armor.