13 has a lot less blood, is approx. 94 min. and has less harsh  language.  The Mature version is approx. 96 min., has a ton of blood,  especially when Ryu fights Sagat at the beginning, has a lot of harsh  language, and added footage to the Vega vs. Chun Li sequence.  There are  shots of her in the shower and more to the actual fight.