Yes, yes, I realize they're different. I personally think that they did it right with a weakening hitbox for most characters, but otg was doing veeery well when it came to placing that meaty hitbox places. As a user of sheiks weak nair to combo things, I think it'd be terrible for the weak hitbox to be first, cause the move would last too long to follow it. I think the way peach and luigi get out of combos would definitely be different. They'd be able to put on some damage, but it probably wouldn't cause knockdowns and such like they do now.
With that being said, I think docs initial hitbox nair is sufficiently strong for most things. It just goes from okay to beastly.
I just think that the fact that they made docs the way it is gives us something to think about, and I don't think its a topic that's been discussed much, from what I can tell.