Hi Andrew,
The reason your cloned RDS dashboard didn't work is because that dashboard relies on a custom JS script. That JS script, which named rds.js is loaded in the DashboardEntry.js script. DashboardEntry.js will load that custom JS script with the same name as the dashboard. The built-in Relational Database Service dashboard is named rds (i.e. its ID is rds), so, DashboardEntry.js will load that rds.js automatically for the dashboard.
So apparently, you need to use "rds" as the ID of your cloned dashboard. In order not to confuse other users, you can give "private" permission to your cloned dashboard.
Hopefully this helps.
Thanks,
//Gimi
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