@joekamprad said in chat that there is a request for such a utility every so often.
And Transfuse has been upgraded to work with Plasma 6. 
Transfuse will let you easily copy and/or compress desktop configurations and more from one user or system and apply it to another.
Optionally supports exporting and applying native and foreign package lists as well.
While package lists are dependent on the pacman package manager all other functions should be agnostic - meaning you can create or apply backups from Arch to Ubuntu, from Ubuntu to Endeavour, Endeavour to Endeavour, or just about any other trajectory.
As always feedback is welcome.