Al thinks it's different. Naoto just came into their lives, so she doesn't have all the inherent baggage that Winry does -- the "We must protect you forever and ever and ever cuz we're gonna marry you" baggage. If it helps, Al is sick that he didn't protect her.

All he'll ask is that they not hate him totally. He's kind of hopeful that she'll be able to... if not forgive, at least get past it. Envy will be a human and learning to be human. All will teaching him, you know, not to be a dick.