I think it is even simpler than you suggest. Cloning an established product is more efficient in terms of both effort (even if costs are subsidized turnaround time is still a measurable physical quantity) and politics (nobody ever got fired for cloning -- if the clone becomes popular, you win, if the clone does not become popular, the West loses).

It is the difference between "safety" and "liveness" (the two kinds of correctness guarantees in computer programming). Communist societies are, at their extreme, "safety" societies: they try to guarantee that nothing bad ever happens. Capitalist/market societies are, at their extreme, "liveness" societies: they try to guarantee that something good/interesting _eventually_ happens (even if bad things have to keep happening).

A "safety" mindset is sympathetic to cloning, because it does not have to deal with much uncertainty. A "liveness" mindset is not sympathetic to cloning, because it has already been done, and profit/monopoly opportunity is minimal.