Heater controls on 68 rally dash

Above doesn't show the difference in the front side, offset of climate controller limb. Definitely enough difference shown to prove they aren't interchangeable.
About the wiper switches... For 67 the knob had a set screw underneath. The lower dash pads for 68 model made it more difficult to access that set screw so first they rotated the same switch 90 degrees. It moved the set screw land to the side but still wasn't a solution. So next change was to add a steel clip inside the knob deleting the set screw and/or need of it. The switch shaft was still small, making the clip small, not a lot of hold. So next change was to make that shaft, its land, and the clip larger. The switches will install there one way or the other.