What is the big difference between Yoga breathing and Zen ...
Zazen is practiced by monks sitting on the floor in the full-lotus, half-lotus, or a few other leg positions, and the monk, with his hands in a mudra in his lap, and eyes half-closed, focuses on breathing from the center of gravity in his body. Monks also focus on koans, or Zen riddles, and practice Shikantaza (just sitting). Some monks count as they breathe, others mentally repeat mantras.
There are many different varieties, or styles, of Yoga meditation (Vedanta, Raja, Surat Shabd, Japa, Bhakti, Hatha) and each has it's own way of meditating.
I don't believe there is any set breathing ratio. If you want to learn to meditate, I would suggest going to a Buddhist center or a yoga studio, where someone can teach you to meditate properly.
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