Sharing WordPress database multisite

I have a wordpress multisite set up. I have 3 sites in it. All 3 have own domain name which is set up. All 3 sites use the same theme and plugins. 1 plugin has a listings section that I want the other 2 sites to share. Currently they cannot. All 3 sites share the same database, so I want know if there is a way to let the other 2 sites share the listings from site 1?