You should have received instructions on how to load the new tunes into the tuner.
I'm pretty sure that when you do that, you will see the screen that allows you to remove the old ones. (Or load the new ones in addition to the old ones; but in your case, I would delete the old ones so I don't get confused and load the wrong one to the car.)
I'm pretty sure the tunes are locked to a specific ECU serial number or something similar. It wont let you load the tune on any other car besides the one it was tuned for. Keeps people from using 1 tune to load on multiple cars without paying for them.