Board Thread:General Discussion/@comment-34924658-20171024194401/@comment-25926288-20171029215629

How I see it...

Both Anas are adaptations of the Wicked Stepsister, but only one is Anastasia Tremaine.

Anastasia (Once) is adapted from the Wicked Stepsister and most certainly based on Anatasia Tremaine, being the daughter to Lady Tremaine and sister to Drizella and stepsister to Cinderella.

Anastasia (Wonderland) is adapted from the Wicked Stepsister and possibly based on Anastasia Tremaine. But that's about it. She isn't Lady Tremaine's daughter, Cinderella's stepsister, and there's no known Drizella in EF.