I think that was one of the reasons for the Eclipse series, to get films out that may not have been restored/remastered or may not warrant a full Criterion level release, but were still valuable films that should be seen. Some, of course, have made their way into Criterion proper, like the Early...
Which really makes it odd to me that DVD Profiler has the box set and 2 of the 3 dvds from it, but not Jungle Book. So bizarre that someone would go to so much trouble to enter *almost* all of it into the database and skip one disc.
Yes, Eclipse is a separately numbered series of dvd box sets Criterion puts out. The Sabu one is #30.
https://www.criterion.com/boxsets/847-eclipse-series-30-sabu
What’s really strange is DVD Profile has the Sabu box set and the 2 other dvds from the set, but seemingly not Jungle Book, unless it only comes up via UPC.