It doesn't matter whether they would have different visages.
Nozdormu is friendly with the Dracthyr at the end of their starting zone, and Emberthal especially as she is the one that went out to spread the knowledge Nozdormu showed her among the other Dracthyr.
He specifically doesn't do evil shit, and they do not distrust him.
Let alone that having Murozond this early makes no sense with how Nozdormu worries about it in the rest of the currently available story.