I don't think that's possible Mark. You have to put a new image into each gallery
And that is not hard -- at least on my
Apple computer.
just drag the image from your old
gallery to your computer desktop; then insert it into the new
gallery.
Copy & Paste your text from the old
gallery, and then paste it into the new
gallery.
It would
help to have 2 windows or tabs open on your browser.