It's interesting to note the main mold differences seem to be his head (Obviously the earlier prototype was prior to the Headmaster figure being ready) and his pectoral sculpting. :)
I also really love the break away from tradition they've taken with his transformation; I'm really impressed that they've avoided the "Fold the legs over the body & flip up a plate" approach, which makes sense for Cerebros/FortMax, being that he's larger than the rest (Depending on your choice of continuity). :cool: