It doesn't matter as long as there are no leaks because of the switch. On most new heater cores, the inlet and outlet tubes have different diameters. Some are close, some aren't. As long as those hoses aren't leaking where they connect to the heater core, you are good to go. The heater core will work the same no matter how they are hooked up AND that "switch" can't cause your other cooling system problems. That was something else.
Check out "YJ V6 Conversion" if you want to see a frame up restoration of my 1992 YJ.
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