I have to agree that this is probably the prince. The part of his hair basically matches taken into account it being longer now that some time has passed..... While the angle of the scar doesn't match, that's a pretty common mistake that artists and whatnot do. (I can't remember what, but I remember watching or reading something where the creator of a thing talked about how they intentionally put the scar in a different spot because it looked better)
I wonder if he's here for revenge or for a redemption arc? I don't think we saw enough of his personality to know if he was as twisted as his parents or was just a "normal" arrogant narcissistic prince. I would not be surprised by some line about how the king disowned/disinterested/removed-his-succession-rights because of his disfigurement.