I think the Bloods are easier to determine than people make them out to be. Im not sure if im correct, but there is a mountain barrier between Malaysia and Sumatra? No? You can generally tell what kind of blood the snake is. Most Malaysians are deep red, but your right, they still can have different colors. But for some reason, you know its a Malaysian even if the colors are different. They just kind of look different in every way. Including the way the head is shaped.