An embedded Job Jackets structure can be used by only one project: The project in which it is embedded. But a free-standing Job Jackets file can be shared by more than one project. (More precisely, a shared Job Jackets file can provide Resource definitions to Job Tickets used by more than one project.)

A shared Job Jackets file lets multiple projects share Resources.

When two projects share a Job Jackets file, they can synchronize any Resources that occur in both of their Job Tickets. So, for example, if the owner of Project 1 changes a color definition that exists in both Job Tickets, the color definition can be automatically updated in Project 2.