Answer. There is not much difference between old and new Transcendental Meditation. There are a lot of differences like there are some changes in status or some changes in mantras. The earlier mantras used were mostly mantras of Hindu Gods based on Hinduism but the new mantras.  It is based on this religion, it is a scientifically proven mantra that affects the mind and there is a difference in its method like Earlier it used to be practiced for a long time but now its duration has been reduced and there are some differences in its teaching as well, earlier there was no institution to teach it but now various meditation centers have been created to learn it. You can learn it.