Hi Monica
I did a little research and the conclusion that I've come to is that Prasara yoga, as a defined type or style, is very much another wonderful expression of the basic tenet of yoga as a moving meditation. The emphasis is placed on flowing into and out of postures while "riding the breath," as I like to put it, mindfully engaging the body in the transitions. In effect, treating the transitions as if they are postures as well.
The work that's been done to break down this concept of flow as moving meditation is remarkable and I'm so glad that it is working for you and your practice. This is yet another example of why I enjoy Yoga so much. There are endless ways to express Yoga so that it reaches the body of the practitioner!