S4 to A4 boot lid swap, B8.5/facelift

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I'm considering this mod to gain the S4's built in spoiler - has anyone done this and have any tips/things to be aware of?

My A4 is a B8.5 so I'm aware I'll need a B8.5 donor. Any coding for the lights and key fob boot opening? Is the refitting of the boot interior a simple enough job?

FYI, I'm looking to have this fitted professionally