If you have two Facebook business Pages for the same thing, you can merge them if:
You’re an admin of both Facebook Pages.
Your Facebook Pages have similar names and signify the same thing
Your Facebook Pages have the same address,
To merge your Facebook Pages:
Now choose two Facebook Pages you want to merge and click Continue button.
Click Request merge button.
If you are not able to merge your Facebook Pages, it means that your Facebook Pages aren’t eligible to be merged. If you see the option to request to merge your Facebook Pages, Facebook will review your merge request.
If your Facebook Pages can be merged, the people who like your Facebook Pages and any Facebook check-ins will be combined, but Facebook posts, photos, reviews, ratings and the Facebook profile username will be deleted from the Facebook Page you merge. Facebook Page you want to keep will remain unchanged, except for the addition of people who like the facebook Page and check-ins that were merged from the other Facebook Page. The Page you don’t want merge will be removed from Facebook, and you won’t be able to unmerge it again.
Note: If your Facebook Pages are on Business Manager, you should visit business.facebook.com/pages/merge to merge them.