Difference between Rear Sway Bar and Rear Torsion Bar?

[praecurvo]

Of course I am speaking in direct application to the FiST.

I've been told that the Eibach Front and Rear Sway Bar kit for this car includes the front sway bar and rear torsion bar meaning these two terms are being used interchangeably.

Is there a difference between a rear torsion bar and a rear sway bar in the FiST application? Does this also mean that we do not have a real RSB.

 

[lukits01]

http://www.autospeed.com/cms/article.html?&A=112587
http://www.autospeed.com/cms/article.html?&A=112588

TLDR;
There are at least four ways in which the anti-roll properties of torsion beam rear axles can be increased.
- External anti-roll bar (added where none existed)
- Internal anti-roll bar (added where none existed)
- Increased diameter internal anti-roll bar (replaces factory bar)
- Clamps placed around beam axle to stiffen it in torsion

With respect to torsion beam rear, Rear Sway Bar and Rear Torsion Bar usually differentiates between internal and external bar.

 

[praecurvo]

I may be beginning to get it.