1991 300TE

do the radio codes go with the car or the radio?

I found a radio at a wrecking yard and if I replace it, is the start-up code the same one in my car or should I have gotten the VIN from the wreck?

Thanks in advance.

__________________
I have never met a man so ignorant that I couldn't learn something from him. -Galileo Galilei, physicist and astronomer (1564-1642)