I definitely think that the face mold for Nellie is different than the one for Felicity, Kirsten, Samantha, Kit, and Molly. I think that it is probably closest to Josefina's--including the frenulum, the lips, the nose not being as turned up as on the others, the bridge of the nose being more defined, the eyes being closer together, a pointier chin, and less broad bottom jaw. Some things that I'm not quite sure about is that the teeth seem to look a little smaller on Nellie, and I'm not quite sure if the chin is as pointy and the jaw as narrow as Josefina's is--I'll have to reserve judgement until I see them in person, side-by-side.
Joy