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The ECU in the 2001 and 2000 models are both version 7.2 and are compatible. The immobilizer modules can be replaced with another one with the same part number.
BUT the transponder in the key, the immobilizer, and the ECU all have to be coded to work together as a set. You can not just take one part such as the ECU from one car and swap it into another without also swapping the immobilizer and key transponder too - or having the set reprogrammed to work. The reprogramming is generally not a DIY, but can be done a lot cheaper than at the dealership.
There's plenty more detail to be found if you search the forum.
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I am not an attorney, mechanic, or member of the clergy. Following any advice given in my posts is done at your own peril.
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