More or less, yeah.
Like, "one or the other of Tum Tum" means there's two of them. Their "psychically-linked cultist-bodyguards" are considered separate, so while they might have some kind of collective consciousness, it's certainly not a symmetrical one. And the vultures having the faces of Tum Tum suggests pretty heavily that the two of them look the same, which reinforces the idea that they have one mind, and then isn't there that example of Bran rebooting Marie's brain by using Tum Tum's? Something like that.