First, and foremost, you don't have to. The Cabinotch Full Access Library for KCD is fully parametric, so if you go off reservation, I mean system, you will be just fine. All your doors, drawers and shelves will work just fine.
BUT, one of the advantages that is still relevant in the age of CNC machines, is that if you stay on system, all your cabinet end panels, doors and drawers will become recognizable in a very short time.
Looking through a list of cabinet parts, door and drawer front parts will become very familiar, and if something is not right, it will be a great big red flag that you need to look deeper (removes the opportunity for mistake from the process).
If you have a wall of shame (you know, that wall in your shop where all the parts that were miss-cut or miss-ordered sits gathering dust), then you might want to consider, or reconsider using the 32mm system.