The thing is that both Google Merchant Center and Facebook Ads have the save template requirements for a data (product) feed. Please, feel free to use Google Template or duplicate the existing Google Feed, if you already have one.
The difference between the two platforms is only in the scheduled feed file uploading. Google Merchant center supports FTP/SFTP while Facebook Ads fetch the feed file via URL. You can find and copy the feed file URL directly on the feeds grid:
and insert it into your Facebook account.
Please follow the link for more detailed instructions.