Except everyone in the Belcher family adores his effeminate quality and overeating, whereas Hank Hill wanted to give his son a whoopin all the time for being not right.
I couldn't believe when I read his filmography that he played a toilet (no joke) in According to Jim
Didn't Loren Bouchard have some kind of role on KOTH?
A good example of reusing characters across different shows is Adam Reed (creator of Archer & Frisky Dingo etc.) - Xander Crews from Frisky is a basically a cross of Sterling Archer and Ray from Archer.
Gene isn't identical to Bobby. Just a similar character tweaked.
Bob is nothing like Hank. Bob joins in on the games, Bob can be just as weird as the rest of his family, and Bob is generally pretty supportive of his kids.
Hank is uptight, straight-laced, blue collar, narrow-minded, and doesn't support most things Bobby likes.
If they share any characteristic, it's that they're dimwits. However, Hank isn't self-aware of his stupidity, whereas Bob realizes exactly how foolish he can be.
Gene is the worst character on this show by miles and miles and doesn't deserve to mentioned in the same sentence as Bobby Hill, at least not in any positive light