I assume the Lossy 384kbps is the best we will ever get of the original Disney dub. Seeing as how no one has ripped the LPCM off of the laserdisc or the ac3 file which is probably comparable to the quality of the one on the original DVD from Disney.
There were video restorations done on these titles. But for the most part you won’t notice the grain management or DVNR except in a couple of places in the second issue of Nausicaa which could just as easily have been the softness of the print. Totoro on the other hand was very clearly given a Disney style restoration. The entire print looks too clean. And the only title they bothered to remaster is Nausicaa. Every other re-issue from Gkids if from the previous master from Buena Vista.
The difference in the two prints of Nausicaa is clear. The original blu ray came from an IP and the new 4K scan off the original negative. The new remaster has been painstakingly timed to the original cels and looks nothing like the original 35mm print, which the earlier blu ray does.