I had LCM issue with my E46 (99 323i) and my research led me to conclude that a new or used LCM will require reprogramming since there's data stored in the LCM that is cross referenced. I bought a used LCM off a 2000 328i from eBay. I got lucky and it worked without any tamper light coming on.

I'm very interested on how your project turns out for when this happens to my X5 so I'm subscribing to your thread. Good luck, I hope all goes well!!!

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2006 X5 4.4i LeMans Blue