Organizer Slideshow Themes can I mix title images

Thanks to various threads here I was able to locate the folders where the Organizer Slide Show creator stores slideshow theme data.  If I would like to have more than three options for slideshow title backgrounds under a particular theme (e.g. Pan and Zoom).  Can I simply copy a title image and corresponding thumbnail from another theme folder into the pan and zoom theme folder?  I am reluctant to mess around in these folders without inquiring first.