These pictures were all uploaded in an odd order, even though I selected "Original Filename order".
But either way, the slightly darker panels are from #00182. The really light panels are from the refinished set. And the ones that resemble the darker ones are from #01606, which is the car you guys have seen me post about. The spare wheel with the white band (now yellow from age) is from #07214, the wheel that is very clean is the "NOS Spare" that's never been used. Whether that is truly the case or not, I will never know. But I can confirm that the spare on #07214 has never had the wheel refinished, and the NOS Spare colour is very close, so that alone is a good indicator for me.
I deem it impossible for tail light panels to wear to the point where they are DARKER than they originally would have been considering the Hub Caps / Wheel Covers get lighter as they age (and that's the colour that everyone says the tail light panels are supposed to be, apparently). So with that in mind, I personally conclude that the TOPY Wheel colour is the original Tail Light Panel colour, and that's what I've documented, with even more samples than you see posted here, and I'm stickin' wid it.
Will post more as soon as I get time so you guys can get a better idea!
Hope this helps anyone on the fence about the colour of these items!