kde-cli-tools-5.27.12-1-omv2490.x86_64.rpm
This package is Plasma5, if you have a Plasma5 system this is what you want to install.
plasma6-kde-cli-tools-6.3.2-1-omv2590.x86_64.rpm
This package is Plasma6, if you have a Plasma6 system you want to install this package.
The tip off as to which is which should not be hard to figure out, look at the package version number. 5.27.12-1 vs. 6.3.2-1. I have been tripped up by this a few times myself.
I believe dnfdragora refreshes repositories before you can do anything with it. Sure looks that way to me every time I open it. I only use dnfdragora for testing myself but I do test it. Discover I just do not hardly use and rarely test. I am one of those that believes Discover is not a great idea to have for OMLx.
IMO a better gui package manager is dnfdrake. I do not use that one either but it works well as far as I know. I find package management from terminal to be easy enough and user gets better information.
Note: Removed, see post below for accurate information direct from the home office about kdesu in Plasma 6.
Edit: Note-2: Removed something that might confuse this issue.