MastanKhan
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Hi,Same reason why the J-31 resembles a F-35 with some F-22 influences because aerodynamics and electromagnetism dictate it to be a good compromise to achieve a goal.
Or it can be stated that for the 5th gen design---there are limited geometric design options available---unlike the conventional design---.
So---most 5th gen aircraft would look alike in their shape & form for best possible stealth form---.