vi-va
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just a naive question,why do chinese copy?
Because we have similar requirement. S-70/UH-60 Black Hawk designed to fit in C-130. Z-20 designed to fit in Y-8/Y-9 transport aircraft. We all knew helo ferry range is short, so medium-range transport aircraft combine with Z-20 has strategic advantage.
Second reason, tricycle landing gear is common in military transport helo, it help loading/unloading from back end.
S-70/Z-20 use conventional landing gear, or tailwheel-type landing gear, it can help lower the tail and make landing easier on uneven surface.
If you consider above 2 factors, it must looks like S-70.
Z-20 is not a copy, you can't say Airbus 320 is a copy of Boeing 737, although they look similar.
The key components are so different, like blades, engines, they are completely 2 helos.
PS: the engine and blade is the key for helo. other components are not that important.