No idea how many of these color differences would be lab variations, and how much would be timing differences in the sources used for the transfers. Any idea how all the other sources compare? (Criterion LDs, the P&S Embassy transfer, etc.)

As for LPP, 1982 is the year the stock debuted. In an article on low-fade stocks on in70mm.com, the author said the earliest LPP print he owns is of John Carpenter's The Thing. That released on the same day as Blade Runner, so it's conceivable that it would have had LPP prints too.

The only odd part is it being mono. I thought Dolby Stereo was fully mono-compatible by 1982, and so separate mono prints no longer needed to be made. (Heck, I was sure that the mono compatibility issues were worked out not long after Star Wars; I had never heard anything about general-release 35mm mono prints of any other Dolby film after it.)