Is there anything I need to know about installing an aftermarket deck in a 2001 Pontiac Grand Am SE with a Theftlock deck?

I have a Clarion CZ-201 deck that I pulled from my old 97 Grand Am SE. I read somewhere that there's something that needs to be done before you can replace a Theftlock deck with an aftermarket deck due to the car alarm system being integrated with it. I don't know if this is true or not, but as far as I know, Theftlock decks only work in the vehicles they came installed in, but replacing them with aftermarket decks should be no problem as long as the wiring diagrams are matched up (which I took the liberty of doing beforehand).

Is there anything to these Theftlock decks, other than the fact that they won't work in other cars unless you reset the VIN or something? I just don't want to take the deck out and put my Clarion deck in there only to find that my car alarm no longer works, or something else stops working due to the change, if any.