Originally Posted by Frobius
Don't think it needs coding. I put my pro HU in the_italian's CCC equipped car to test his system and it worked fine. As long as you get the same one as you've got, it'll be fine. If you buy one that cane from a logic 7 car and yours doesnt then it'll need coded, yes.
OP, What he said.
Albeit, some features may not work on your car.
I have replaced my HU with LCI HU and without coding new HU had phone option on it. It did not work on my car and as soon as I coded it to my car, it came up with the compatible options of my car.
In your case, if you have telephone and HU from the donor's car hasn't, then you would defo require coding.