If you read the original series bible then it shows how different the Filmation cartoon was compared to what was originally written for MOTU. I'm pretty sure that Filmation developed the Sorceress to be more bird like. The original dramas (such as the Kid Stuff record) always had Zoar as a seperate bird that was as large as the toy figure (wing span of 20 yards). Also Evil-Lynn turned herself in to Screech.
Jawbridge mentioned it - Mattel started to alter their creation based on what Filmation did since the cartoon became so popular.