Gators have U shaped snout— that’s easy. Crocs— like Nile Crocs have huge V shaped wider at the join of the upper and lower jaws. Crushing force of.... tons. Gators have almost as much depending on the side. You can hold the jaws shut with one hand (weak “opening” muscles) but don’t let them squirm around and shake your hand into an open jaw— curtains for that hand, and maybe more.
Also crocs teeth on outside, alligators inside...............