Ehhhhhhhhh I though about that too, that maybe that's what they were going for, but I don't think so. It'd be one thing if it was just the forehead appliance being blended in with the actor's real skin tone, but I think the overarching problem is that the actors look like their entire faces are absolutely smothered with makeup. Like, this guy:
It does not look like they blended the colour to match his skin. It's not that the prosthetic on his head looks fake:
his entire face looks fake. To me it looks like they just shotgun-blasted a crapload of make-up all over rather than attempting to blend it in.