The Falcon 9 rocket that launched the Second OrbComm OG2 Satellite and a cluster of 11 small satellites was an upgraded version called “Full Thrust” or v1.2. This new design facilitates booster reusability for a larger range of missions including delivery of large commsats to geosynchronous orbits. The main external difference between the new version and the v1.1 is the height of the rocket. The second stage and Interstage have been enlarged for that reason.
Grid Fins design has been revised for the new v1.2
V1.1 (left) and v1.2 (right)
Comparison of both Falcon 9 versions showing the height difference of the Second Stage and Interstage sections.
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Falcon 9 v1.1 Commercial missions