I dont really know what "68 more than the cap" means but here is the scoop.

The extra series, cap series, Katana, Yak series, sukhoi series, Edge 540 (T), Ultimate Series, Pitts Series etc. are all considered "aerobatic" airplanes. All of them (with the exception of the Katana) are scaled after or in the Edge 540's case before a real aerobatic airplane. There are some differences in looks and differences in flight characteristics of the planes. For example: The Cap 232 excels in tumbels, the extra 330 excels in precision, and the Edge 540 is a mixture of the two with a pretty forgiving recovery from 3D moves. Overall the differences are slight and it really boils down to the pilots flying style and preference as to which airplane he picks. The Funtana is a "fun-fly" version of the Katana. There are a lot of differences between the katana and the funtana. Its hard to explain, just a different feel. H9 is best known for the funtana however Exclusiv makes one that is larger that will blown the H9 funtana out of the water. The difference is $$.

Please note that all of these planes are not created equally. If you get a creek hobbies Katana and compare it to the Exclusiv Katana its like flying a totally different airplane.