My new desktop! Can't wait to display all three together.
The Mark II has rivets on the body and that's all that's different (besides the paint job) it should have some rivets on the head too but they aren't there. Other than that it has 3 pairs of hands instead of two, and the second head is the Tony Stark head in the helmet with the visor up. Also it has the display box with the first reactor he got from Pepper, and the ones from Sideshow have the exclusive bust accessory to display whatever head you aren't using.