Can someone help me understand size discrepancies with various types of media

I'm having a hard time understanding why some files of media are 4x bigger but still have the same "features".

For example, furiosa, I picked a random movie using Kodi and fen light.

A 4k option that is 80.27 GB has Dolby vision/HDR/hybrid/hevc listed as "features"

But if I scroll down, a 26 GB option has the same "features" but is almost 4x less the size.

So what makes one media 80gb, and the other 26gb when they both offer the same "features"

Sorry if this isn't allowed or listed somewhere else...please downvote to oblivion if that's the case