IDrm350

I have first hand experience with this. The BCM does not need to be from the same car. I'm not sure whether it's the BCM that they reprogram (in the case of a used BCM like the one I bought) or the chip in the key, or both. Nonetheless, I know for sure that you can use a used BCM from another car. You will need Nissan to do the programming to allow the car to start also.

If you want to use all of the stock parts, they do not need to be from the same car. The immobilizer is part of the BCM so you will need to have Nissan program the keys you end up using to work with the BCM that you buy.