Twister shares the same trailhead and first 2/3 of the trail as Billy Bob. The section of trail shared by both trails is very mild and some consider the fork from Billy Bob to be the trailhead to Twister.
Twister is easier than Billy Bob, due to a lot of rock stacking, and not traveled as much. Both trails end up in roughly the same area and use the same access road to get back to the pavement.