User blog comment:Miskos3/Fairy Tail 539: World Destruction, Review/@comment-24053170-20170611084444/@comment-4933386-20170613084323

That is very tricky question, I guess we'll have to wait til future chapters to answer that.

Despite that, apparently Anna and Lucy looked different since Wendy didnt think "you looked like someone i knew" when she first met Lucy, same goes for Natsu and others. I'm guessing they'd have different scent too, but Idk how Natsu can detect similar smell and tell they're related etc.