A normal install will not pick up any existing files, configuration, etc.. The only ones I ever bother with are for e-mail and web browser. (Same SW on old and new installs) These I just do with links.
In principle, you could copy any directory that is specfic to an application---eg OpenOffice, GIMP, etc.
You can try keeping the same /home folder, but my bias is that it would be more trouble than it is worth
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