Led Zeppelin cd box set remastering quality

I am contemplating the Complete Studio Recording box set as one-stop shopping for the stuff I don’t have on vinyl, especially since I can get it for a seemingly reasonable $60 new. My questions are:

1. Anyone know when and at what rate was the remastering done for the box?
2. The individual discs I have were done in 1994, presumably at 16/44…are these the same transfers used for the box?
3. Do we think they might do new transfers? I know the doors discs I own from the second remastering at 24/96 are noticeably better than the originals.

Thanks for any input.

--will