As far as I know the right-hand-drivers came with a Japanese manual, plus the differences between the JDM and US technical manuals would also be in Japanese (there were many more JDM manuals and the prices were pretty outrageous - seems the expectation there was for the dealers to have them and not the end consumers). In the US there are two different climate controls - the VX transitioned during the 2000 model year - so even the electrical troubleshooting manuals came in two versions here (different wiring harnesses). Since a completely different harness was used in the JDM version, I'm not surprised there would be differences between the switches and other components as well.

Most of the switches are interchangeable between the VX and US Rodeo models from about the same years - the same is not true with the VX and Trooper models. I'm not sure how much luck you'll have going that route. It's been my experience that the Isuzu switches rarely go bad, however I'm assuming the toggle-type and not rotary/multi-position slider (not sure which is in your VX?). Have you referenced the electrical troubleshooting manual offered on VX.info?

-- John