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 app should be installed in both the sites to make a connection

Click on add connection
Enter connection name
Enter site url
Click on Generate connection token
Copy that token

Open destination site & click on activate connection
Paste activation token & click on Activate