Curiosity got the better of me. For $9.99 at Target, I got my answers. In a nutshell, the new version is not exactly the same as the old. Here are some details.
The old disc is a 1999 Republic/Artisan version, while the new 2103 version hails from CBS/Paramount. So what's different?
The menu has changed, the chapter stops have changed, and there are additional language tracks on the CBS DVD. And I detect a different video master. It's not exactly a "Re-" master, but it is a different master. There's a sharper clarity to the new image with deeper blacks, and the newer version seems to have a brighter and warmer color palette, though don't expect miracles. This was processed for television on video, so it can only get just so good on today's HDTVs without going back to original film elements like they're doing with STAR TREK: TNG. And that's not about to happen with an also-ran Stephen King TV miniseries. Just the fact that it's available and once again in-print should be sufficient for fans.
Here are some screen-shots from both versions for what they're worth. The first of the two will be the old Artisan version, the second is the CBS DVD.
Artisan first, CBS second
Artisan menu, CBS Menu
Artisan plane shot, CBS plane shot
Artisan entering terminal shot, CBS entering terminal shot
Since I really like this crazy movie, I feel vindicated in the double-dip, if only for the fact that I've had one Artisan DVD go bad on me, and the replacement I got on eBay has a slight crack around the hub. $9.99 at Target was a pretty good deal.