The huge difference is Hayward was much better at driving and drawing contact. He's was a much more natural scorer and tougher player.
I actually agree with the comp. Huerter is far from just a 3 ball shooter. Lots of highlights of him being crafty about getting into the paint and scoring down low.
Besides, comps aren’t saying they are identical players. Recent photos of Huerter bulking up def reminds me of Hayward though...