You've got to realize that there are some questions that are gonna come up a few times.

[ Still, the more she thinks about this the more she starts to feel a little concerned. ]

Hey, uh, what do you think you'll do if you run into our Zuko? Guy Zuko? [ Because she doesn't seem to think that they're actually the same person, just changed somehow. This Zuko didn't have the other Zuko's memories, after all, so Korra can only imagine this is somehow some other kind of Zuko. ]