Being located inbetween China and India, Tibetan Medicine makes use of a range of medicinal substances, indigenous, Chinese and Indian.
There are other differences in how some of the treatments are now done, but the differences above seem to be the most prominent.
Wishing you all the best.
Not a bad summary. There are also differences in Anatomy -- Tibetan Medicine has many influences form Galen; and through Galen, influences that go back as far as Hippocrates.
Whereas internal anatomy in Ayurveda is not terribly well developed, it is very well developed in Tibetan Medicine. Further, since Tibetan Medicine is also a tantric system, it is integrated completely with Yuthog Nyinthig (as well as other related systems), and as such has deep connections with the teaching of the great perfection.