Book comparison feature between existing issues

[sam5558]

Is your feature request related to a problem? Please describe.

This is a feature request for being able to compare between two existing books, so that we're able to determine which one we should keep and which should be thrown.

Describe the solution you'd like

The mechanism is the same as when we do import a book, you already have an efficient comparison tool. It would be useful to use it on existing books.

Describe alternatives you've considered or other apps that can do what you want

I have no idea on any other project that is implementing this, i sware i'm a loyal kavitakomga soldier 😄

Additional context