Hmm, I can't recall that Dave, have to check my archives.@speedy300dturbo has mentioned in the past that although both reflectors and lenses are different between LHT/RHT, the reflector has more effect than the lens. It would be an interesting science experiment (@Jlaa?) to mix & match parts and see what the real-world effect is.
Of more concern is how to determine if a car that spent any time in Japan/UK/etc with LHT that has RHT lenses... also has RHT reflectors. There's no way to tell from external photos what reflector is inside a lamp assembly. I believe it was Arnt / @500AMM who posted a photo showing how to tell the lens version (LHT vs RHT) from photos, which is super helpful, but the reflector is a bigger headache. A Japan import with correct lenses and wrong reflectors could still have 'backwards' light output for USA/European roads.
And, of course, the RHT (USA/Europe) reflectors are NLA. They had been ±€100 or so, I think, prior to NLA.
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But I recall I made a presentation about the differences on the mirror angles on LHD and RHD cars some years ago, post #8:
REPLACING RIGHT HAND SIDE EXTERIOR MIRROR WITH RIGHT HAND SIDE MIRROR FROM RHD CAR? | Body Shop
*UPDATE*
Maybe it is the overview in post #37:

WANTED - Does anyone need 500E "Euro" headlight lenses? | Wanted to Buy
I have the opportunity to get two sets of new "Euro" 500E headlight lenses while I'm here in Germany (it's all I want to carry back). They are 147 Euros apiece plus tax. Does anyone need a set? These are "comm blocked" in the US and would require shipment if ordered from Europe (which is not...
![[500Eboard] Headlights & lenses 124.036.jpg [500Eboard] Headlights & lenses 124.036.jpg](https://www.500eboard.co/forums/data/attachments/127/127874-ffcb1417cb7a5cf59740fa6559245051.jpg?hash=_8sUF8t6XP)
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