To differentiate, I'd expect something on sailfish.org to be Sailfish (FOSS) community related (roughly comparable to meego.com), and something on jolla.com to be Jolla exclusively related (roughly comparable to nokia.com). However, in practice Sailfish is inseparable from Jolla at the moment, so this indeed can create some confusion. I got the impression though that Jolla intended Sailfish to be more broad in the future.