Hi
another way can be to enhance the cockpit lay out picture
where one can see HUD like J20 in jf17 though other
blks still without it
thank you
Yeah, the block 3 uses a wide-angle hud. However I don't think it's the same as what the J-20 uses. If anything, the J-20 hud seems to have a thicker "edge" surrounding the hud, which itself is narrower than what's on the thunder. The takeaway is in terms of hud tech, the JF-17 block 3 likely uses newer tech than the J-20 in service.
I found images of J-20 and thunder block 3's HUDs below for some comparison.