Sharing users between OnDemand instances is not possible. However, you could achieve this easily by subscribing for JIRA and Confluence together in one OnDemand. eg: JIRA and Confluence in control1.atlassian.net
As you have already JIRA OnDemand, just subscribe for Confluence in OnDemand via MAC (https://my.atlassian.com ) to add it to your current JIRA OnDemand. Once that is settled, proceed with the import of your Confluence instance (cf1-confluence.atlassian.net) data to the newly subscribed Confluence OnDemand instance in controlf1.atlassian.net . So JIRA and Confluence users will share the users.
Hope that clarifies your question.
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