Russian engines have primarily been high-pressure designs, while American engines have primarily been low-pressure designs.
However with the full design and build specifications in-hand, with trial engines already built to verify the specifications and designs were correct, the US can build high pressure engines.
Will they? That's a good question. Russia has effectively been giving away engines for cost to keep their space industry from collapsing. Under those conditions I don't see how it's economically feasible to not buy them from Russia, since being wonderful capitalists the US military would buy them from companies who build subcomponents for a profit to the general contractors who put the subcomponents together into the basic components who turns around and sells them to... and the very far end of that chain is the military, who pays Lockheed and Boeing for the completed product.
I sincerely hope SpaceX succeeds financially, as it really represents a change from the subcontractors of subcontractors of subcontractors pyramid that represents the traditional US space industry.