wiper switches compatability

I don't know if the physical differences really matter but worthy of mention...
The 2 flats that orient the switch in the panel were rotated 90 degrees from 67 model to 68 up. About the same time they moved the thermal overload protection from inside the switch to outside the switch. Its possible that these physical differences are the only differences and either switch will plug in and function the same. Like stated above, wire count, color, orientation in that harness connector is the key.