It’s a not given that one copied the other. They could be independently developed and converge to a similar design simply because they happen to target similar objectives and requirements.

Its possible, but not very likely.

Keep in mind the USA is not above copying another nation's spacecraft.

Here's the Russian MiG-105 they first flew in 1976 in atmospheric tests (it never flew in space):

Australians recovered a scale model from the sea that Russia launched in 1982:

Here is the NASA mockup from 1990 for the USA's HL-20 derived from NASA reverse engineering the recovered model:

Here is the private US company Sierra Space's current vehicle under construction Dreamchaser derived from NASA lifting body research currently scheduled to fly to space next year (delayed):