mmm while i don't really subscribe to "chara revival" sort of AUs anymore they're still fun to think about so i'm going to say Yes! i Do think their body would be less... human or alive, which is something they'd have to get used to and have Moments over. cold skin, lack of heartbeat maybe, sickly pallor, etc. i imagine it'd be a wway to bond with flowey in such a universe maybe? as a sort of "it's really weird being forced into a body so drastically different from what you're used to/a body you didn't sign up for/a life you didn't ask to be brought back into" cause for both of them it'd be a reminder they can't escape right? with flowey already, i imagine his body and his lack of compassion are a constant reminder of his own grief, a raw wound he always touches and opens and is always hot and aching. with chara it'd be something similar, too. both of them after such an event would be different or changed people, so they wouldn't even get the comfort of pretending things are back to how they were before, i think, but they at the very least get the comfort of knowing there's somebody else Like them.