It’s not pretty, but the easiest way to clone databases in a workspace is as follows:
Share the Space that contains the databases as a template.
Copy the sharing link to the clipboard.
Rename the space to something random (e.g. just add an X to the space name)
Paste the sharing link into the browser and choose to import into the source workspace.
Now you will have two spaces (the original, now named BlahX and the new one, named Blah).
Of course, my natural question would be why you want to have the same db twice within a workspace?