If you have a deep pan, the bottom of the pan will likely have a step where it goes from being deeper to being shallower while the shallow pan will be flat across the bottom. A deep pan also may have either a drain plug or a round depression that looks like a spot where a drain plug might have gone. The filters for the deep pan have a longer neck where they plug into the valve body so that they reach deep enough to pull up the fluid from the deeper pan. I've never heard of anyone trying to use a shallow filter in a deep pan, so I don't know how risky that is. The cost difference at AutoZone is minimal, and it's easy enough to tell the difference, so I'd just use the correct part unless someone has a good reason not to.