I bought the LMR ones about 5-6 years ago. From what i understand they are made differently these days. I don't think there are many vendors for these so all the OE-style ones you see are likely made by the same shop, or same couple shops. I have the ones with the yellow sticker on them that says "don't touch". If oyu have a set you'll know what i mean.
I do have a set of OEM NOS headlights in box. Don't want to use them, but can't bring myself to sell them. I did open the box and compare to the LMR repops and they were pretty darn close. Now, in terms of longevity and materials? I mean these headlights have been on my car for 7-8 years now and still look new....but my car also spends 99.999% of the time in the garage. Can't comment on leaks either as i only take it out when it's sunny. But my point is for my needs and cost, i can probably buy 20 sets of repop headlights and nobody will tell the difference between them and my OE NOS lights.
Edit: i also don't drive the car at night, so something i've never really been able to compare