Importing and Exporting SQL queries and Dashboards

I have 2 instances of Metabase ( v0.53.6.6) on which I have various SQL Queries and Dashboards. I would love to merge them by exporting them from one of my instance and importing them in the other one.

This Export and import of collections, questions and dashboards into another metabase instance with same Schema seems to indicate this is possible, but I am not sure how we access this serialization via API

Thanks,

That's a paid feature.
It is possible to do it by copying from one database ot another but it's not supported and you have to ensure that each instance is using a different range of ids. Your's won't be as it needs to be setup first.