Stormrider wrote:What's the difference between Black Convoy with a Decepticon symbol and Scourge?
It's already been explained by a couple people but I think story-wise, Black Convoy (the Decepticon) in the original Japanese storyline was a straight up evil clone of Convoy, whereas Scourge was technically a new character who just happened to take on the form of Optimus Prime/Fire Convoy when scanning an alt mode and only appeared in RiD/Car Robots.
Autobot Black Convoy is a whole different story, he's an upgrade of original Convoy, I think, or an omnipotent dimensional-traveler, if you pay attention to that Alternity silliness.