Ookay so if you're a nut like me this might be of some interest. After viewing that wonderful IB Tech trailer I sat down for a bit with my various copies of YOLT, trailers across videos, and the IB Tech trailer.
I did this on my calibrated Trinitron CRT. Here's what was really interesting when going back and forth between all of them. Comparing all the trailers, shows that this IB Tech scan is from a US 1967 trailer with the US narration, cropped form the scope original. The UK narrated version found on all DVDs is the same footage but in scope. (The so-called US version merely dubs the US narrated voice onto this same scope trailer). Comparing the two reveals that the brown of this IB Tech wasn't in the original and may have partially resulted from the cropping. (I've seen this happen often on trailers of this vintage if cropped. Not sure why it happens.) Most striking is the teaser trailer only found on the 1989 LD. (Can be seen here: https://www.youtube.com/watch?v=SaoS9yH3tks)
When comparing my 89 LD, 93 LD form the Connery Collection Vol. 2, 1997 pan n scan VHS, SE DVD and UE DVD this way I found an odd thing...it appears that the SE DVD was a quiet remaster which would be in keeping with the abandoned THX Laserdisc reissue series that was scrapped in 1998 and all ported over to the SE DVD line. For example: The VHS and LDs have a cropped and off center gunbarrel that was fixed for the SE DVD. What is most striking is the difference in overall color tonality.
I had always assumed that the SE was the rough equivalent of the LDs and that when the UE was made no one had taken the time to dial back in the proper color timing akin to the theatrical release. In comparing all four, it shows this: The 1989 and 1993 repressing LDs are virtually identical, with the latter being maybe pressed slightly better and having perhaps just a touch difference in skintones. The SE is far more detailed but has increased noise and an overall blanket of this brown-yellow cast that is only fully apparent when looking at each copy in succession. The UE is the most detailed because of the later scan but as usual appears as if it had been bled dry of color.
The odd thing really is that the 89/93 LD appears to fall somewhere between the SE and UE. I don't know if MGM scanned a Technicolor print for the proposed THX LD or something but it is certainly a different transfer from the LDs.
The scene I used for checking was the opening and especially Ling's apartment. In Bond's initial closeup in bed it should be possible to see Sean's tan lines around the neck and forearms. The UE makes this glaringly obvious, the SE has him far more reddish and thus obscures much of this, and the LD allows for a bit of both. Also, the walls are a general mix of browns, but this is pushed to the maximum in the SE.
Now I really need to get that stinking blu-ray....
EDIT: After this experience and my observations on the THX Moonraker LD, I don't think it's always safe to assume the SE DVD/THX LDs will match their counterparts from the 1989 LD series and previous. It seems that starting with the Thunderball CAV box in 1995 MGM began working on new transfers for each film.