We have two trays with different systems, DCS and SIS, going inside the building in the same MCT frame / cut-out. How these will be separated if they're using the same MCT? Again, two different trays will be waiting for them inside the building going to their corresponding system cabinets.
It's unclear what the MCT is, but whether a tower or tunnel you appear to be questioning separation between two autonomous systems.
A great deal depends on process and client requirements. Some will allow cables to run on the same traywork whilst others demand a significant minimum distance.
Do you know what the demands are for segregation of DCS and SIS?