OCP is a patent of the US military. OCP is actually a Scorpio camouflage made by the US military before. When CP Company was working as MC, the US military wanted to use it, but CP said that it had to pay royalties. The U.S. military simply stopped using MC and directly changed the former Scorpio into today's OCP.
MTP is a patent right bought by Britain. MTP can be said to be the son of MC, and it is made on the basis of it.
There is not much difference in technology, but the color blocks in details are different.