Dealer won't install a used PCM

I need a new PCM for my car, the dealer wants $850 to install a new one. Dealer says he cannot reprogram a used PCM that I acquired for a 2002 chrysler concorde limited, it has all the correct part numbers and sequence numbers on the used one. I cannot just plug it in because it is not programmed to my key....is this correct???

the dealer is abosolutely correct. If you have Sentry Key and the module you're replacing doesn't accept Sentry Key, you'll have a communication code set and you're engine won't start. Also, if your car is a 2000 & prior, the PCM is different from a 2000 Concorde & a 2001 Concorde. Also your PCM has all the information needed to keep your engine running such as the weight, specific engine (2.7 vs. 3.2/3.5), transmission (autostick or not), etc.