Sbus is different amd much faster. SBUS can be connected in 2 ways, by the Serial BUS connector which gives a kind of digital serial network signal with which servo's and other equipment can be adressed, this port can only be used with pure SBUS compatible servo's.
Or you can just connect them on the channel output which gives an 800Hz signal with a center pulse of 760uSec, 720uSec servo's are common as fast tail servo's for RC helicopters and the fastest are mostly 500Hz but I have seen 800Hz servo's from Xpert.

The so called Sanwa SSR servo's are not compatible with Futaba's SR mode