"Perhaps it would have something to do with why you were scrapped." Rey says this so matter-of-factly, but the truth is she was in the same situation at one point. She also was supposed to be terminated, only to be taken and repurposed instead.

Like Nick, she also has never met anyone who she had technically 'replaced' before. Or, at least, the people whose memories and identities she had taken. They are all just a part of her now.