Off the top of my head, I don’t know. I’ll set up a test tonight or tomorrow and let you know what I find out. It’s an interesting question.
–David
Hi Suzy,
Jon and I discussed this and we believe that your best approach is to use child themes. Here’s a tutorial on Child Themes:
http://www.elegantthemes.com/blog/resources/wordpress-child-theme-tutorial
Basically, instead of using the active theme at all, you would create two child themes. These can be as easy to create as making a folder, creating a file called style.css, and dropping in a few lines of text.
This is WordPress’ native method for handling changes to themes and I use it on most of my sites. Each child is treated like a full-fledged theme by WordPress, but you can tweak it out without making any changes to the master theme.
Give that a try. It should get you where you want to go.
–David