The RMC was the coach version of the standard routemaster. The buses were used on Green Line route network, which linked london outer areas with central london.
I post a photo of RMC1453 [in red] taken at Lambeth North, and a comparison shot of RM85, so you can compare the differences: apart from the doors, there is the blindbox and the headlamps.
RCL2260 was the coach version of the RML, and here is RCL2260, owned by Blue Triangle and restored to 1965 Green Line livery. photo'ed at Kennington Post office.