Right, little update:
Went to the shop, started flicking through the Mitchell service manual for '91 and found a few things that raised my eyebrows a bit.
According to the manual, the switches and plugs are identical, the wiring is what's different. The GVR4 plug uses maybe 1/2 or 2/3 of the slots on the plug, whereas the TEL unit uses mostly ALL of them. I imagine it has a lot to do with the flip-up lights on the TEL for 90-91. Also, the diagrams in the book showed continuity tests, and their respective terminals for tesing the switch and its wiring. The pinouts are so different its insane. For instance, to check the switch on a GVR4, you simply check for continuity between pins 3 and 12, then 3, 12, and 16 (with switch in the headlight "on" position). For the TEL's, you measure between terminal 6 and about 7-8 other terminals (with switch in "on" position).
Long story short, could you re-pin a TEL switch? Sure. It'd simply be very time consuming, given the difference in the number of wires/etc.
Just figured i'd share!
-Jakr