Well, acoording with the director of the first three seasons, her client asked for the og voices from the 90's (along with all the old names) but manga/crystal fans were not happy with that (at least with the names), so they revert the names back to the japanese one and they had to redub again (I mean, you can hear how they call Usagi "Serena" at the end of act 2 lmao).
For netflix I guess they just wanted to continue with the same cast (but I heard they changed Luna's voice idk)