I'm sure they are the exact same discs from before. This goes for the prequel dvd's as well as the 2006 oot. So this is just a new box. Nothing is new or different. That being said, I think this is still a small victory. It's far from deluxe or even basic standard but think about it, there has been progress.
First, we weren't even going to get the originals ever again. Then Lucas finally caved but only to laserdisc standard. And you would have to buy the '04 versions again and individually. Plus the 2006 gout would be be discontinued at the end of that year after less than 4 months. LFL even said that would be the only time the original versions would be released on dvd. But then for some reason they were kept in print and still are available. Now they for some reason release a slim boxset and keep the originals included with the ot. LFL has caved in a little further.
Now the average person who just buys the set at Christmas because it was on display is going to get the originals. Before, I would think that many who don't know about the different versions would still buy the '04 box set over the individual releases because they would prefer one package. That same Joe the Shopper would now probably buy the new slim sleek set because it has all the movies together and is cheaper than the '04 set. This will get the oot more exposure beyond the people who specifically wanted it. And I think more people will become fans of the originals. It also sets a precedent to have both versions (in some form) in any future release. I think some people at Fox or LFL definitely want the originals restored. So they've gradually creaked the door open slightly more and more as much as Lucas will let them.
I know this is another lame release where they only spent money on a new cover and box. But the more widespread the oot becomes, the more likely demand for the originals restored will increase. This takes momentum out of a possible blu-ray release without the restored oot. Plus more people will probably notice the vast color differences between the 2004 and 1993 versions.