Source #01: [yolerejiju] Nausicaä of the Valley of the Wind AKA Kaze no tani no Naushika 1984 1080p BD REMUX FLAC 2.0 [Audio: Multi] [Sub: Multi]
Source #02: JPNBD | (Korean Audio) # I forgot to add it to the remux

Comparison: REMUX - ENCODE: https://slow.pics/c/vAC2Bphu
Comparison: Japanese FLAC - QAAC: https://lensdump.com/a/uwD2k
MediaInfo: https://pastebin.com/c1VfwZn7

x264 log

x264 [INFO]: frame I:1116 Avg QP:17.35 size:298937
x264 [INFO]: frame P:34220 Avg QP:18.63 size:172051
x264 [INFO]: frame B:133024 Avg QP:20.12 size: 75555
x264 [INFO]: consecutive B-frames: 1.5% 1.7% 6.0% 13.1% 15.9% 59.1% 1.9% 0.2% 0.1% 0.0% 0.0% 0.0% 0.1% 0.0% 0.1% 0.0% 0.1%
encoded 168360 frames, 7.30 fps, 18538.12 kb/s, duration 6:24:16.54

I adjusted the PGS subtitles with BDSup2 to make them look correct since I cropped the black borders.
I didn’t adjust the ASS subtitles, they don’t look the same but since there aren’t as many signs they don’t change much.