Is there any way to have Scrum board in JIRA instance that shows tickets from different instances with out duplicating and than syncing JIRA tickets?
JIRA version 6.4.14
Same question, but 3 years earlier: https://community.atlassian.com/t5/Answers-Developer-Questions/Is-it-possible-to-combine-tickets-from-different-jira-instances/qaq-p/476585#U622318
No. The two JIRA instances are separate and can't index each other's issues.
You need the suggested synchronisation that you mention
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