The better match would be the Superlink Galvatron General for Protector. He's closer in size to the Protector since he's an Ultra and more accurate in color. The Energon Megatron mold preferred would have to be the two pack one also, that's the Ultra class. Otherwise the regular editions are both Leader Class, kinda big to compare to Rodimus/Protector but better compared to MP Rodimus.
So Protector goes better with smaller two pack one and MP with the big one? I have a general idea but pictures would help.
found a pic on google for Galvatron General and Rodimus Protector, not that clear though http://www.google.com/imgres?q=galv...9&tbnw=212&start=0&ndsp=15&ved=1t:429,r:2,s:0