not really. the only difference i a stutter. a bug in his vocal systems. he is just overly trusting of Weil ad treats him special due to the fact that he owes him his revival. other than that, they act the same, because they ARE the same. he says that he owes Weil because he brought him back. Weil's specialty is revival of reploids. he revived Copy X just as a pawn to gain entrance to his inner circle, and later, gain control of his job. Weil anticipated that Copy X would fight Zero. he anticipated that he would lose. no, he KNEW he would lose. and he anticipated that Copy X would once again use his seraph transformation against Zero when he lost. to that end, he put a bomb inside him that would be triggered by the activation of the seraph form. by that way, his death could be pinned on Zero, and he, already haven been given control of the military, since the remaining big 3 were stripped of their status as leaders of the military forces, with Weil making them seem like complete utter failures in their job. he planned it all from the beginning. but he needed the Naive Copy X for it. so he brought him back, and Copy X owed him for it. the Mk ll is simply to identify he is the revived copy X. sigma, by now himself, would be around Mk 9. (not counting the first GBC game, as im not sure how Xtreme 1 places since it was all digital...)
savvy?