As with about every other flavor of Linux out there, you can "add" an environment & switch between them. Logout of one, then log back in with the other. As for "same except the looks" thing well, you will have to tweak the new environment just as you did the old one; sorry. The great @dalto nailed it with the setting back up (snapshot) senario. Not a good idea to restore one environment setting into another one. Monster Hybrid or totally broken... bad mojo.