Get the SCENE ID of the scene you are copying FROM: You will need either the scene ID, or the scene URL (for ease of copy and paste)
Visit the scene page of the scene you want to copy INTO:
Paste the ID/URL from the FROM into the URL field of the scene
SAVE! We have no way to pass this along otherwise, it must be saved first.
Now select Select With... and pick "Copy Metadata from Scene to Scene" It will scrape your old scene, and offer you the info dialog box, just like a normal scrape.
You can choose which items to change (as usual) by clicking on the checkbox/X to select or deselect each item