When we link your new troop site to an existing troop site, we will copy all event locations from that troop into your site.  If you go to Calendar → Maintain Event Locations you will see all of these locations, as shown below.

Locations are "tightly linked" between the troop sites.  If you update any information about a location on your site, those changes will be immediately copied to the other troop's site.  If you add a new location to your site, that location will be immediately copied to the other troop's site.

The only exception is the location photo.  Photos will not be synchronized.