Although it would be wasteful of electricity, you could have two temperature zones in a single freezer with the higher temperature confined to a single carboy and the lower temperature dominating the remainder of the refrigerated space.
Put one controller on the freezer's plug and place its temperature probe on one side of the chest's interior. Set this controller to your lower temperature.
Put the other controller on the plug for a carboy heater belt and wrap the belt around the carboy you want at the higher temperature. Set that controller to the higher temperature and put its probe inside the carboy, near the center of the wort. Wrap the carboy and belt in a fire-retardant blanket to insulate them, keeping as much of the belt's heat inside the carboy as possible. Put that carboy, belt, insulation and all in the freezer, as far from the other controller's temperature probe as possible.
Put your cold-loving wort in one or more carboys and place them in remaining empty space in your freezer.
Over time, the freezer will attain the colder temperature which will chill all of the contained wort, including the contents of the belted carboy. The probe in the belted carboy will detect the undesirably low temperature and turn on the belt to heat the carboy. A little of that heat will escape the insulation and reach the colder probe, causing it to turn on the freezer to lower the undesirably warm temperature. A tug of war would proceed from there, wasting electricity, but keeping both sections of the freezers at or near their desired temperatures.