Steve, as you probably know, the ex-Moffat Capri has a specific chassis number, mentioned on the NZ Capri Club site. Not long ago another was sold from the TWR museum when TWR went bust. I didn't record the details but it was identifiable by the no.
There was an extensive story on the Moffat car in NZ Unique Cars magazine, which was reproduced at this site:
http://www.geocities.com/theultimatecapri/cologne.html
The cars were built by the team under Mike Kranefuss, so by my understanding only those RS3100 Group 2 racers would be considered Cologne Capris.
Anyone else?