Title says it all; I wish to replace Mint XFCE Petra with Lxle while preserving all my app configurations and settings if possible. My Petra install currently shares a USB HD on one ext4 6 gig (1.5 gigs free) partition next to a FAT 12 gig one which contains my work files.
I'm not a techie, just a play-it-by-ear newbie but I'll take a shot at tinkering under the hood if one shows what!
You might give a search at uDuck a shot at serving up a detailed answer on this one. http://uduck.org/
There are a few strategies to keep your /Home directory, but when changing out distros, a lot will get lost in the translation. Your best bet is to either bite the bullet and start fresh, which will give LXLE a clean slate or at the least doing a backup of your apps.
Some apps may not be installed in LXLE, which you would have to remedy.