Backup from one Freepbx wont restore on another?

I’m not sure if this is a new variation on this theme:
I have FPBX 14.0.3.18 working on one (old) server.
New install on another (new) computer has updated to 14.0.5.1

Using the backup from the old computer (.tgz) I browse for that and upload it to the Restore page of the GUI from a local folder.
Then I hit restore, and nothing happens (on the gui, anyway)
This technique has always worked before.

Is the problem the different version of FPBX? If so, how do I downgrade to 14.0.3.18 so they match?

Possibly unrelated: This failure to restore happened just after doing this:

fwconsole ma upgrade dashboard

Once done, run

fwconsole reload

to deal with Admin GUI Dashboard Error after module update today

Coincidence?

Any help with the Restore issue much appreciated.