Can I link my existing MockFlow.com account with Atlassian JIRA / Confluence integrations ?

Due to Atlassian license restrictions, your existing account / license at MockFlow.com account cannot be merged or linked to MockFlow integrations with Atlassian JIRA or Confluence.

This is because of the following reasons:

• MockFlow integrations with Atlassian requires a separate license to be purchased and assigned based on your user count already available in your Atlassian account.
• A single MockFlow Team account is automatically created with your Atlassian company account. This provides seemless sharing and opening of MockFlow apps from within Atlassian JIRA/confluence without additional login.

Is there a way to copy changes between Atlassian integrations and MockFlow.com account ?

You can try following the steps listed here -  https://support.mockflow.com/article/86-how-copy-paste-between-wireframe-projects