Its hard to say which may be more accurate since there is obvious differences in color and brightness; the GOUT releases, IMO, actually exhibits little to no color deviation from what we know of the original release print, other than minor deviations from the telecine, so I'm inclined to say that that 70mm is way too bright, especially considering that still photos from the scene have that dim quality that the GOUT exhibits.
Using film scans is dependent on bulb intensity--a weak bulb will make it look to dim and a too bulb will basically overexpose (not accurate but its close) the image.