...however it's not a direct copy in the sense like J11 variants vs the SU27 where it was initially built under license and then they made incremental improvements on later variants such as better avionics, composites etc.
Its funny you mention the Su-27 and its derivatives like the J-11 because that is exactly the family tree I was thinking of. I happened to be just going through the threads here I looked at the Z-20 which then made wonder if you could fit into the S-70/UH-60 family tree in some way.