You can export all issues from JIRA_A and use the External System Import under the System menu to import them to JIRA_B.
Importing issues from JIRA to JIRA is easier than a third party system to JIRA as all the fields should map nicely if they are configured the same.
It's related to this post:https://answers.atlassian.com/questions/30947751/how-to-access-issues-in-jira-instance-a-from-instance-b. The user wants to access the data in the instance A from the instance B.
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