[DCP-o-matic] Trusted device KDM for Cineworld Glasgow Silverburn screen 11

Hi all, This is a bit of a long shot but maybe someone can help. I'm trying to help somebody make a KDM for Cineworld Glasgow Silverburn screen 11, which appears to be a dual-projector ATMOS room. We have the certificates for two TI ICPs and an Doremi IMB, and an example KDM for this screen. The IMB and ONE of the ICP certs make sense, but the fingerprint of the other trusted device in the working KDM does not match the other ICP cert (if you see what I mean). Can anybody shed any light here? Won't the ATMOS processor (CP850?) also require a certificate in the trusted device list? Thanks for any insights. Carl