commingling JIRA project instances

[michelle]

Can different project instances in JIRA be commingled?  If so, can you export a native JIRA file/data for just one project instance?  

[Ryan Fish]

@michelle

What are you trying to accomplish? and why?

If you mean mingling boards, then remember the board is just a view of a query. You can combine as many as you like for export, have at it. 
BUT
It will not play nicely with native JIRA reporting.
And there is a 1000 row limit 

If you mean mingling JIRA instances, then the answer is "it depends". The data fields would need to be named similarly (exact) across both instances or you will have corrupt or, at best, misaligned data.

Hope this helps