Here is a different example of upsizing your punches for mounting purposes:
You need to punch out two of the backing pieces and deal with each according to the pictures above and below
The red piece represents your punched greeting or image, so begin attaching the four backing pieces you have left. I usually attach the red to the saffron, but for your benefit, I have turned it over so you can see what is happening.
Allow an equal over hang on all four pieces
The end result...