the cases for the iphone 5s and the SE will be the same.

No it is not the same and can not.

The front facing camera is interchangeable but the rear camera is different

Unfortunately no.

yes it does.

Some don't ship with kits. Just depends on where you buy.

True, but for those that this is their first repair then it can cause a hiccup.

4s? did you mean 5s? No touch ID is interchangeable for Touch ID function. But as a home button only yes the 5s/SE will work either way.

No they are not.

No they are different with a few of the standoffs being located differently.