Right, spoke to VW dealer today about the Passat CC Camera, typically neither of the two running demo cars or the showroom car had the reverse camera option.
Now are you sitting down for this

The key components from the diagram on ETKA are: -
Camera @ £158.27
Boot Mech @ £211.94
Control Unit @ £181.50
This excludes any additional looms or connectors that could also be required, plus if trying to truly integrate this with the VW RNS or RCD screens it is likely to require one of the latest gen CAN gateways.
Also while the rear badge/lock mech are very similar diameter (forgot to take a tape measure to confirm exactly) the Passat CC version appears to be deeper and is a slightly different shape underneath.
HTH