Replace Most, But Not All, Books on My Kobo

[JSWolf]

Originally Posted by koberulz

Decided to convert the book I'm currently reading—after dropping all my annotations into Obsidian—because it has a lot of footnotes and that's a much smoother experience with kepub than with epub.

I was 31% of the way through the book when I converted it. I went back to the same place in the book after the conversion, and now I'm only 20% of the way through? Huh?

Page numbers work completely differently between ePub and KePub.

RMSDK (ePub on a Kobo) assigns one "page" for every 1,000 characters of text. This ensures that "Page 50" refers to the same block of text regardless of whether you are reading on a large monitor or a small smartphone screen.

KePub us mostly one screen is one page. So your settings such as line height, font size, and margins can change the total number of pages.

[Readirect]

This isn't an answer to your question but its a (rational) solution:

The benefits you would gain from converting to kepub -- not that great, in any event -- are FAR outweighed by the complexity of what you want to do AND SINCE you've already read them, what's the point in doing so?

Convert those you have not read and leave those you have, alone.

Problem. Solved.