Are /6 torsion bars the same as 318?

Sway bar does jack for suspension travel, its like a hinge attached at the bumper: when 1 tire goes up, the other tries to go up the same amount. This is important for cornering when the inner tire wants to raise. The sway bar acts as a torsion bar between the control arms, resisting twist just as the torsion bars do with the control arms front to rear.
A coil spring is actually a torsion bar wrapped in a coil. A thicker or stronger torsion bar resists twist more than a small or weaker metal one. They are all rated in lbs..