Did they specify the faces were supposed to be past incarnations?
They accompanied Morbius asking "How far, Doctor? How long have you lived? Back to the beginning!" So yeah, they were pretty clearly meant to be past, pre-Hartnell incarnations of the Doctor. Sure, that's incompatible with how both earlier and later producers of the show approached things, but there's no doubt it's what was intended here. Continuity and Doctor Who
have always had a tenuous relationship.