I'm looking to transfer over an immo2 from another vehical and the item part nos the same, do I need to worry about the program side of things, once vagcom connects the two,is it the same information to the ecu?

Part no. 1H0 953 257 BB

Thankyou for replying. Your right. Gen 1 immo.
    Mapping was the word I should have used, so once this one goes its gone for good. Comparability to the old one should only be for the keys, adaptation and vagcom can link all this!? A bit of bad luck if that's all.
    So is my only choice to use an emulator instead and find a program to remove immo on the ecu. Then I plan to swap the ecu, will there be a program to save its contents for the new one etc?

One of these parts is allowing extra electricity through the starting system whilst key is on only and burning out starting components. It seems easier to absolve this hard problem via this alternative, (as all the other parts have been replaced new until there's nothing disputed)