Biography from Wikipedia via TMDB
Supporting role · Director: George Stevens
Sources: lddb.com (opens in a new tab)
1995 Image Entertainment LaserDisc has exclusive extras not ported over https://www.lddb.com/laserdisc/06310/ID2496TU/Gunga-Din:-Collectors-Edition
Supporting role · Director: Melville Shavelson
Kino Lorber Blu-ray 6K master from Paramount
Supporting role · Director: Lloyd Bacon
4K restoration from Original Camera Negative
Small role · Director: Charles Vidor
Sources: Criterion Forum (opens in a new tab)
A new transfer from the optical soundtrack negative.
the older Blu-ray is included in the Criterion 4K Blu-ray
Small role · Director: Sam Wood
Probably Kino Lorber Blu-ray
Sources: Blu-ray.com (opens in a new tab)
While no comparison is available, this is indeed a new 4K restoration. However it has its problem like not scanned from best surviving prints due to some issues, or technicolor out of alignment but seems to be still better than older releases
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