No....Theftlock, has nothing to do with the wiring of a new radio.....theftlock is built into the original radio to lock up, if power is lost to the radio....
As I said, the only difference is if the circuit has an external amplifier, and if the vehicle has Onstar......you can tell if the amplifier is in the circuit by looking at RPO codes....if you have U85, you have the amplifier....
One thing that troubles me....you say you have some orange wires disconnected...looking at the wiring diagram, orange seems to be a power source....