You will need a system that can "sync" between JIRA systems. There are none built into JIRA, so you will need to write one for yourself, or better, have a look in the marketplace for add-ons to handle it.
https://marketplace.atlassian.com/search?product=jira&query=synchronize will get you a list, but you will want to narrow it down more (as it's showing things other than jira to jira)
If you spend enough time as a Jira admin - whether you are managing a single, mid-sized instance, a large enterprise one or juggling multiple instances at once - you will eventually find yourself in ...
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