Yes I think turkeys can see color. Why else would their heads turn colors during mating time?
Match the camo to the area you hunt and try to stay in the shadows when possible. But no, all your camo does not have to be the same pattern. Different patterns can be helpful. Such as having more brown in the pants to match the forest floor and more green on top to match the leaves on bushes and trees. Mainly though, keep still and have some major fun!