So basically you've discovered that the constant 12v from the CCM to the interior lights is missing when using the original CCM, same issue that I had.
My answer to the problem was to cut the wire off of pin 20 and connect it to the wire connected to pin 22 (12 volts into CCM), whereupon all the interior lights started to work as you would expect them to.
Entirely up to you if you want to do this but I've had no issues with it since doing it a couple of years ago.
Your other option is trying to find somebody to code the replacement CCM for your car and I have to say I would be surprised if coding was the issue. I'm only aware of being able to change the number of doors that unlock and whether the car has 2 or 4 electric windows with VCDS coding of the CCM, but then I've never looked into it any further.