To change DME's between vehicles, this is what you need:
-All tumblers (ignition, door, trunk, glove box...)
-General Control Module V (this will allow the remote to work)
Remember, these all have to come out of the same car.
I actually have a spare DME for my car (in case my primary one takes a dump). I have two EWSs and keys under the dash. In case I need to change out the DME, everything I need is right there. I have an old ignition tumbler zip tied under the dash with a coil snapped around it. This keeps the key from falling out.