A NCDC2013 is paired with the head unit, the integrated CDC3 unit and the screen.
A NCDC2015 is paired with head unit, the integrated CDC3 unit, the screen, and the telematics.
As long as all components are fitted to the same car, no need to worry about coding.
If you want to split them or mix & match, then you need the pairing codes used to pair them together in order to de-pair them, and then you can pair together the bus you want with a code of your choice.
If you absolutely, 100% know the car that they came from, and that they were fitted from the factory, then you can get the code from that car's carpass - it will be the Security Code or Immobiliser Code on the carpass.
If you can't get the carpass for the car it was factory fitted to, then you need somebody clever to sort it all out. And I only know of one person with the knowledge of getting the code from the unit....