Newbie: 4K LOTR, what to rip?

[4Klotrfan]

Hello, I just got the 4K version of Lord of the Rings (full trilogy, theatrical and extended, Amazon Prime Days special), have a working Blu-Ray player supported by makeMKV (no problems there) but what I'm struggling a little bit is what to rip from the disk, so any guidance will be appreciated. My end goal is to have all the trilogy (extended editions) in 4K MKV in a NAS playable by Infuse from a 4K AppleTV.

Example:

the second disk from Fellowship of the Ring (extended version) shows the following list of files in makeMKV (before ripping, 9 files)

FOTR-2-makeMKV.png (54 KiB) Viewed 198 times

and after ripping, I see the following (8 files)

FOTR-2-ripped.png (46.79 KiB) Viewed 198 times

Besides the fact that I'm seeing 1 less file, what's puzzling me is that there're 2 files of 82.05GB size, and that if I open them, they both seem to have the same content (including all audio languages and subtitles).

The Lord of the Rings- The Fellowship of the Ring (EXT.) PT. 2_t06.mkv
The Lord of the Rings- The Fellowship of the Ring (EXT.) PT. 2-SEG FPL_MainFeature_t02.mkv

1 - is one of these files more preferable than the other? There might be some features available in one and not on the other one?
2 - If so, how can I find what's available in each one?
3 - Why is makeMKV showing 2 files at 74.96GB but after ripping it, the file size is 82.05GB?

Thanks in advance for your help!

[dcoke22]

Probably one version has chapter markers and one does not. I prefer the chapter markers, but to each their own.