do you mean just for gun laws or do you mean laws in general?

Man, I know only that laws for guns and having sex with animals differentiate between states.

Not really, its different laws for different opinions on things, like California full of liberals who hate guns so they have extremely strict laws pertaining to guns hasn't really worked out to well for them though and places Like Texas are more conservative and enjoy guns so they are more lenient. In this way all the gun hating liberals can go to Cali and all the Gun loving Conservatives can go to Texas