On a well-kept system it should return nothing.
Should probably be ignored, at least for now.
But the rest include important changes and related packages. Including
To understand what they are heres manjaro and arch links respectively:
https://wiki.archlinux.org/title/Pacman/Pacnew_and_Pacsave
I recently did a quick type-up of how I would handle them;
An example would be /etc/pacman.conf and /etc/pacman.conf.pacnew.
Almost certainly this pacnew file is to reflect the removal of the [community] repo.
So the pacnew will have the entry missing in comparison to the file on the system.
You would want to edit your file to reflect that.
A pacsave is pretty much the opposite.
The change was forced, with the updated file taking place.
But your original file with your original configurations are preserved in the pacsave file.
You compare them just the same. But in this case you are trying to ‘add back in’ your own configurations if applicable.
(in your case this only applies to /usr/share/icons/default/index.theme.pacsave)