The second one you linked to should just be a re-issue of the first, but I can't confirm all the extras would be the same.
Well, as you cited, it does come in a slimline plastic DVD case. As far as extras are concerned, well, there's a brief introduction in French (shades of Tony Curtis' odd, pointless, but humorous intro to Mr. Arkadin, perhaps...but this guy wasn't wearing black gloves...and I am not fluent in French, so it may have been quite a bit more straight-laced), and that's it. You do get three viewing options for the film, though: English, French (I'm not sure, though I would assume that you can activate subtitles for this one), and English with French Subtitles. There's no alternate audio track with the extracts from "This Is Orson Welles" in this version or trailer (though, thankfully the [excuse the pun] Magnificent Ambersons web site has the trailer available for viewing, even if they did chop it up into several pieces). So, it is a less expensive alternative to the deluxe version, but after seeing just how incredible the film really is (despite the choppiness during the second half), I do wish that I had went for the deluxe version. But then again, I do still hold to that whimsical notion that maybe a print of the full version will turn up someday and be released on DVD...
Anyway, as a general observation of the soundtrack...has anybody else noticed a Stravinsky influence creeping in during some of the earlier cues? It was somewhat amusing to think that Herrmann would deliberately compose in this manner in evoking an American era (which is a much different sound than, say, Aaron Copland, who spent quite a bit of time doing the same thing in a different manner), though I have to say that the cues were excellent.