Not too sure about the outlines on the back of his head lol - Also it's kinda hard to see the differences on their own so I put both side by side - changes: shoulder spikes spikes on the back of the head (white outlines) face (front sprite) chest (it would move slightly up in the front frame) and shoes (I also modified the ears just a tiny bit to make them move a bit smoother during rotation lol)
Credit to @K9_Indi (all I did was smooth things)