When I install Linux I copy over all my config files from my last install (if not just copy my whole home) - its essential otherwise I'd be wasting time reconfiguring.
I also build up a set of config files for copying over to Linux systems that I install on other people's PC's.
Most contig files will be found in ~/
(user's home) as hidden dot-directories, and also in ~/.config/.
Then in ~/.local/share you have .desktop files for the menu if you made changes there and marble map images if you use that.
Files I migrate/tweak for LXDE installs
|Config Files||File Location
|Openbox window decoration/work spaces/keybindings/mouse behaviours/menus/app opening positions||~/.config/openbox/lxde-rc.xml
|Libreoffice toolbars||~/.config/libreoffice/4/user/config/soffice.cfg/modules/swriter/ etc
|.Xresources, .bashrc, .bash_aliases||~/|
I also regularly backup config files somewhere safe, with a script (for LXDE)
lines 3 &4 swap for these if openbox not lxde: