Here's the document outlining importing OnDemand users: https://confluence.atlassian.com/display/AOD/Importing+Users
That said, you'll not have access to the backend (as your merging users from one OD instance to another) so we'll have to do it for you :)
If you'd raise a support ticket at support.atlassian.comletting the team know you'd like to have the user bases merged from one instance to another they should be able to fully export one user set and import it into your second OD instance. When creating that ticket please be sure to specify the target userbase you wish to copy and the destination OD instance you wish to copy to. Also note that your license will need to be large enough to accommodate all of the extra users in the destination instance.
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