Is yours not working or are you trying to upgrade?
These radios may look the same, but some have features others don't, and some of those features might not work if your vehicle wasn't originally equipped (at least with out other parts).
These can lock, and they need to be unlocked with a tech2 or by opening them up I believe. Also GM used these in everything, you can get one from a Cobalt and use it.
But if I'm being honest I'd go with an aftermarket radio, they are just better and that's coming from someone that usually prefers an OEM look.