Having last seen The Stars Look Down about twenty years ago, I am relying on memory here, but this is definitely not Reed's original cut. A clue may be found beneath the credits on the back cover, where is printed "USA 1957" (the movie was made in England in 1939), making this likely a reedited cut for stateside re-release.
The changes are not to the good. The final scene with Nancy Price and Michael Redgrave is gone, replaced by some highfalutin narration from Lionel Barrymore over a shot of storm clouds (he intones as well over the opening shots of the miners, doing similar damage to Reed's conception and the film's tone). Also, though I am not so certain about this, there may have been more scenes involving the Millingtons, a married couple played by Linden Travers and Cecil Parker, with implications of an affair between Mrs. Millington and Joe Gowlan.