It's not a question that needs to be answered. It's simply pointing out that the same character design was used in two different manners. Any "answer" we could come up with would simply be speculation.
About the macguffin from GIJoe episode Glamour Girls, one probable reason Serpentor wanted it was for spying. They could have saved a lot on foam latex and wigs if they could literally make themselves look like anyone from the neck up.
I know. That's why I removed it. The note read "It is never fully explained as to WHY Serpentor, or Cobra, would even WANT the Facial-Transference Device, nor even what they could possibly use it for. ". I was absolutely dumbfounded that the editor who had added it couldn't see exactly what you said here.
Because it's not an error. It would be just speculation. Highly likely speculation, but speculation nonetheless. They could have wanted it because they just don't like the shapes of their noses and wanted to try a different look. Or Destro and the Baroness might have wanted it to spice up their "personal time". Yes, it's probably for infiltration and such, but that is so obvious it doesn't need saying. It would be like having a note that says "Well, they never really said WHY that guy was robbing a bank when Batman knocked him out."