I want to change my 2002 oldsmobile intrigue v6 3,5l engine control module ECU

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I want to change my 2002 oldsmobile intrigue v6 3,5l engine control module ECM. Someboby can help me about which code number will directly fit in my car without needed to take it to the dealer for a flash, reprogramming. I have been told that each Engine module unit has a specific code that make it fit without a need of reprogramming at the dealer.