That's an interesting comparison, so what-if the J-10 was acquired by the Israelies -----
I notice that the plan view is of the single seaters whereas the side views are of the two seaters.
Oddly (or coincidently), I was just looking at the Trumpeter 1/72 J-10 two-seater I have on Monday night and then your post pops up yesterday. I was comparing the differences between the J-10 and J-20 kits to see if there was any design follow-through. There is a bit but there's other elements in the J-20 which tends to hide it.