Siege voyager prime is a fantastic figure, but I always feel that his head looks a little young, as the leader of autobots, I think he need to be more serious. Then the galaxy upgrade prime brings me a new headscope which looks just like that of MP10 I change the head, here is what I got This is the blue eyes verison, he looks just like mp10 now
Yes I've done the head swap myself and both Primes can still transform with the new heads. Also those blue eyes really pop.
As much I do like the "younger" Prime head, I'd been wondering about this after Galaxy Prime was shown after doing a switch with Magnus. Now I see and it DOES look good .