You don't, it's not really that useful an idea as there's no real way a merge process can know what you want from the process.
I would take the two filters at the heart of the boards and "merge" them - come up with a single filter that returns both sets of issues. Then create a new Kanban board that uses that, and then take the settings from the original boards and work out which ones you want to keep.
...PermissionsStartOnly=true User=www-data Group=www-data ExecStart=/opt/jira/bin/startup.sh ExecStop=/opt/jira/bin/shutdown.sh TimeoutStartSec=120 TimeoutStopSec=600 PrivateTmp=true [Install] WantedBy...
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