Yes. Bit for bit identical. Practically: Almost. The only difference is menu navigation and seamless branching . Some complex discs (like Frozen II or Apocalypse Now ) use seamless branching to offer multiple cuts. A REMUX (specifically an .mkv file) sometimes stutters during these branching points or loses a few milliseconds of audio sync.
A 4K REMUX averages 50-90 Mbps, peaking over 100 Mbps. The result is a pristine image. Film grain remains intact rather than looking like digital noise. Dark scenes in The Batman or Dune retain all their shadow detail without compression artifacts. Streaming services cap audio at Dolby Digital Plus (E-AC-3), which is lossy. It compresses the dynamic range, crushing whispers and explosions together.
Welcome to the deep end of the pool. Bring a hard drive.