You don't want the SKC from the new ECU, you want the SKC from the original ECU.I took two actions in the last two days. I bought an Xtool and I contacted the vendor of the new ECU that I bought to see if they could supply the SKC. Here's another question: If I pull the ECU and I can't retrieve the SKC from the new one will I be able to put the old one back without a problem? I identified a local shop which specializes in this kind of work. It's within a mile of me so I'd feel OK driving the car over if that ends up being the way to go. I still want to try to do it myself.
Once you have the SKC, you can code it to the new ECU (or a used ECU) with VCDS.