Importing comments to another wordpress installation

We’re having an issue with importing the FB comments in a new wordpress installation, it seems using the export and import feature would import actual wordpress comments, but it doesn’t do anything with the faceboook comments.

Is there a way to get these copied over without having to duplicate the entire database?

The current site is https://fitlife.tv

The one we are trying to import them to is https://sandbox.fitlife.tv

https://www.ads-software.com/extend/plugins/facebook-comments-for-wordpress/