Regretfully, we cannot provide support for third party plugins or scripts as our support policy in the sidebar states due to the fact that there is simply no way to account for all of the potential variables at play when using another developer's plugin or script. Because of this, any questions you have regarding setup, integration, or troubleshooting any piece of functionality that is not native to X / PRO will need to be directed to the original developer.
That is sad because PRO header footer builder is exclusive only to PRO Theme. If your other site is not using PRO then you can't import the header/footer.
Thank you for your understanding.