Maintain Changes to Free Design with Pro Version?

I just bought the Pro version of Simple Catch mainly so I could have a better mobile version of my existing site that is on the free Simple Catch version 1.3. Site is tattooseo.com. I've done a lot of changes to post layout, page layout, css, header, etc to get it looking the way I like it and was wondering if there is a way to upgrade to Pro without losing all of those changes and essentially starting from scratch? Or is there a way to simply make my version compatitible on all devises by just uploading certain folders from the Pro theme? Thanks