Can I make my admin key the spare key?

I have a 2015 Ford Mustang and I have two keys one is the admin and the another is a spare the admin key is all broken and it falls apart all the time is there a way to switch the admin privileages to the spare and make the spare key the admin key

You must not take very good care of your smartkeys. You might be able to change the key if you disable Mykey with the current admin key, and then reenable it with the spare key. If that doesn't work, you might have to take the car to the dealership to revoke the original admin key. Once that's done, you should be able to use the spare as the new admin key.