If you have created a layout and would like to see what the same images would look like in another template,  then simply drag the layout (in Thumbnail View) and drop it onto another template.

This will automatically create a new layout from the template containing the same images as the original layout. The images are placed in the new layout by opening number (i.e.  image in opening 1 will go into opening 1 etc).

If you then wish to swap images between opening then simply drag and drop between openings (in Show Layouts View).

Note:
This feature is only available as of version 3.1.3 and newer.