What is the difference between 'Witnessing the thoughts' vs 'Mindfulness of the thoughts'?

I am a bit confused about what is the difference between 'witnessing meditation' as taught by Osho, which can be found here , here , and here , and 'silent present moment awareness ' (*page number 11*) as taught by Ajahn Brahm in his book, 'Mindfulness bliss and beyond'. At first, they both seem identical to me, but as I practice with Osho's instructions it's difficult to get to that point He describes. I would appreciate if the commentary is provided along with the answer from practice point of view.