Jerry I've been chatting to my 'viper tech' you cant straight swap a 2000 onwards PCM into your car (they have a different cam), the PCM is programmed with different cam/timing overlaps and would cause all sorts of problems for you.
I'm not sure about re-programming, maybe you could just send yours away
By all accounts the swapping the euro PCM to a US on its own is only worth about 10bhp, apprantly the euro PCM's are setup slightly different due to a difference in octane ratings. If you decided to go ahead with a earlier US PCM, you will also need a simm kit to turn off the check engine light on the dash