How to compare data between two databases in PostgreSQL?

Question

Is it possible to compare two databases with identical structure? Let say that I have two databases DB1 and DB2 and I want to check if there is a difference in data between

Answer 1

I'm also looking for a tool to compare data in databases (in particular I was interested in comparing Redshift DB). So far the best I found is https://www.dbbest.com/products/database-compare-suite/#close. Unfortunately the free trial expires after one day.