I have been acting like a detective today, as my mom says, and I think I have been too. ;) Ever since I saw the preview picture of Rebecca I have been trying to find clues. I don't exactly have clues, but observations!
I cropped AG's close-up Mia picture and the Rebecca picture...
Mia's eyebrows and Rebecca's eyebrows look like they are a totally different color! Mia's hair looks redder too. Rebecca's hair may have a slight red tint though. It looks like Rebecca and Mia don't have the same face mold either. Also, to me Rebecca's eyes look darker, but it may just be the different lighting between the pictures.
Isn't this exciting! I hope more observations and clues come to us soon!:)