To most common Joe/Jane that's the only/1st thing that came to their mind.
Hell, if Z-20 mounted 2 gatlings on the side, a refueling probe extended like that of USAF's Pave Hawk, and if PLA extend their new low-vis paint scheme to their rotary assets, 10 bucks say 80%+ of people would call it Pave Hawk in the first 5 seconds.
But for us, we can always tell which is which when observes the following:
I won't add rotor blades despite it's obvious because we've seen fake photos of Z-20 in the past...
- front canopy (2 glass, UH-60 series use 3)
- engine exhausts (no IR suppression exhaust on Z-20)
- paint job (semi-gloss on Z-20, mat on UH-60 series)
- insignia (high-vis on Z-20, low-vis on UH-60)
They needed a UH60 size chopper capable to fly well at high altitude and made in China . So same functions of a UH60 with a biggers engines and better lift. You cannot reinvent a general layout for the same size and function... it's just inefficient.
If the Y20 is doing the functions and specs wanted it's just a great addition to China airlift !