No, they're not.
Orbital are sometimes confused with The Orb, a similarly-named band that has also been very influential in the realm of electronic music. In its early days, The Orb (and William Orbit) often did remixes of other artists' songs and called the result an "Orbital Mix", but these remixes have nothing to do with the band Orbital. The Orb stopped this practice after Orbital became popular, in order to prevent any further confusion.
I've heard 3 albums by the Orb and didn't really get the fuss.