Hi Dave,
From my standpoint in Support, there's not a tool we have that can do this. The best option is to go through them via the Marketo interface itself. If you're looking for campaigns which use particular flow actions (for example, Sync Lead to SFDC, or Delete Lead), we can help with that, or if you want us to connect the two subscriptions so you can import programs from one into the other, we can do that, but there's not a way to export a list of assets that I know of.