Cross site connections
You can setup connection between 2 Jira sites to facilitate project migration, Jira configurations clone, restored Jira issues
To connect two different sites, Revyz - Data Manager for Jira | BYOS app should be installed in both the sites to make a connection and also region should be same both the sides.
Click on add connection
Enter connection name
Enter site url
Click on Generate connection token
Copy that token
Open destination site & click on setting in left navbar - > activate connection
Paste connection token & click on Activate