Correct there is only one OSM database feeding both this map and the main map on openstreetmap.org (and other maps). It shows the power of open data. You can t

Correct there is only one OSM database feeding both this map and the main map on openstreetmap.org (and other maps). It shows the power of open data. You can take the OSM database, and slice out the bits you want and only show what you want.