If you swap them left to right, right to left, the internal effect on the bar is to untwist it. They will break. The part number is stamped on the back hex end of each bar. Along with an L or R denoting which side it belongs on. Also make sure not to put nicks or gouges in them since it will become a stress point that will weaken the bar to failure.
There is a tool to remove the bars, but there is a different way to remove them if pulling the front end apart for rebuild that only requires a 2x4 wood block and a mini sledge once you dissassemble certain things..
First thing you do after the car is jacked, under stands, and chocked w parking brake set, you take the tension off the torsion bars by backing out the adjusters in the lower arms, remove the upper control arms, and old drum brake assemblies, what will be left is the lower control arm, the strut rod going into the K frame, and the torsion bar.
You remove the snap rings the hold the torsion bars in at the back of the trans crossmember, unbolt the strut rods at the K frame, and where the rods bolt to the lower control arms. With the strut rods loosened and disconnected, and the torsion bar snap rings removed at the crossmember, undo and remove the 2 nuts in the K frame that hold the lower control arms in place. Place the wood 2x4 against the front side of the lower control arm, and smack it back towards the rear of the car with the mini sledge. This will push the arm out along with the torsion bar. No torsion bar removal tool needed.