For some colour heads, you can replace the "diffusion chamber" with a smaller or larger one. This allows you to match the chamber to the film size. The purpose of doing so is to shorten exposure times when you are using smaller films.
In any case, if you have the "diffusion chamber" that works with your largest film size, it will work well with smaller film sizes too.
Different manufacturers have different names for the diffusion chambers.
I don't have any Durst equipment, and haven't used Durst equipment for 30+ years, so you should look further for Durst specific answers, including whether the Durst equipment you are interested in has the ability to switch diffusion chambers.
Good luck and have fun!