The Shark10 and the B11 share the same piston and sleeve. They do not have the same crankshaft tho. The Shark10 uses the crankshaft out of the C6/B10. The new B11 has a new crank timing that is a little less aggressive and will yeild a little better run times with a little less overall power. The B11 also has the new head button that had an o-ring support in it, but thats not any kind of performance change.

Parts for the Shark should still be available since it is the B11 P/S/R and the C6/B10 crank.