My experience with granite counter tops is that they are held in place with multiple dabs of silicone caulk placed on the top of the cabinet boxes before placing the granite. With the doors open and the drawers removed, if you use a small putty knife you should be able to go inside the cabinet and carefully separate/cut the silicone bonding the granite to the cabinet. Save the current granite for the new granite installers, it can be used for a template to cut the new top.

I wouldnt touch it without a waiver that acknowledges the hgh potential for damaging the cabinets if they are not removed. The granite is likely to break as well. No stone fabricator is going to want to template with the cabinets in place, or use the old piece as a pattern. Houses shift, and walls and cabinets move. Stone constricts some of that movement, until it is removed. “Exact same sized” things do not go back in the same place, as that shape changes when things are removed.

Didn't I see this post already or am I going crazy?

I think you'd have to disassemble the upper structure in order to replace the top. The cabinets should be screwed together but the crown and other trim are probably nailed, and will be subject to damage.