How to achieve data replication between two DBs with no connection between two accounts

I'm reading the user guide for AWS DMS and in particular there is this point

Create source and target endpoints that have connection information about your data stores. https://docs.aws.amazon.com/dms/latest/userguide/CHAP_Introduction.HighLevelView.html

My use case is to send database replication or snapshots from one AWS account A to another AWS account B. The issue is that the two accounts cannot be connected and I'd preferably send it through the AWS network/backbone. But from this quoted point from the user guide, my impression is I cannot use AWS DMS whatsoever.

The two DBs are AWS RDS postgres databases.