Yes there are two different fast passes. The dream fast pass has one fast pass for all the fast pass rides in a park (I am not sure about the MK). The other fast pass (I think it is the golden fast pass or something) gives your group an all-day fast pass to ONE fast pass attraction (you don't get to pick the attraction).
A family who was chosen as the first family of the day for KS at AK invited me along with them. We were all given dream fast passes at the end of the ride and the family was presented with a golden fast pass to ride KS as much as they wanted for the rest of the day.