According to this:

The two main types of hot yoga are Moksha and Bikram. Both use a series of Hatha yoga postures, each held for 30 to 60 seconds. In Bikram yoga, all postures are repeated twice, while in Moksha yoga, many postures are repeated twice and there is also a set series of poses that flow together.

In both disciplines the same series of postures are repeated in each class. This allows participants to continually refine their technique and go deeper into the poses. Classes are 60 to 90 minutes long and are suitable for beginners as well as more advanced students.

Bikram yoga is the one where they heat the room to 105 degrees. Moksha is an offshoot of Bikram, invented just a few years ago by a couple of Canadians. Bikram is 26 postures, Moksha is 40. Moksha also has an emphasis on greenness in the studio – natural cleaners and renewable building resources. In order to be a Moksha teacher, you must be certified and approved by the founders.