Yes! Each metric table includes the fields SellerID, MarketplaceID, MarketplaceName, and ProfileID in order to enable filtering of pages within a report using a single table. This removes the need to write a customer query or join/blend your metric tables to the seller, seller_marketplaces_mapping, and marketplace tables.
The merchant identification fields were added to each metric table in the v1.1 database update release per item v1.1b: http://bit.ly/datareleasenotes