A modified variant of the MS-06J, The JC-Type featured improved rocket thrusters which were slightly more powerful than those fitted on the standard J-type. The most significant change to the design of the Zaku was the movement of the cockpit.
It was moved higher up on the chest and in the center behind the T-piece armor rather than on the side of the T. The cockpit was also redesigned. The control sticks were moved to the sides of the seat and more screens were added. Despite these modifications, the two models were essentially the same in appearance. [Source: wikia]
You can download this paper model template here: Simple MS-06JC Zaku II Free Gundam Papercraft Download