Difference between SIG P232 and P232 SL
 

I saw on the Prison Break - Season 4 page that there are separate entries for these two different(?) P232 pistols. I can't find anything on google. What's the difference between the two, or what is the P232 SL?

Normal P232 Stainless
http://www.imfdb.org/images/6/63/SigP232.jpg

P232 SL Stainless
http://www.imfdb.org/images/a/a5/P232_SL.jpg

Considering the SIG website doesn't recognize the difference-it lists standard, two-tone, and stainless- it don't think there is any.

There is a difference, i think the SL model had night sights as standard. I assume the SL stands for "SigLite" which is what SIG-Sauer brands their night sights as, but not sure. I think later SL models also came with wraparound finger grooved Hogue grips as standard.