Buddhist nonduality allows multiplicity and divergence. At the level of emptiness – we are indeed all one: your emptiness and my emptiness—the emptiness of everyone—is the same. However – emptiness is only one aspect of reality. The other aspect is that which continually arises from emptiness: form. At the level of form – we are certainly not all one, we are different. Nonduality is the inseparability of this sameness and difference.
p23, Entering the Heart of the Sun and Moon http://arobuddhism.org/books/entering-the-heart-of-sun-and-moon.html, Ngakpa Chögyam and Khandro Déchen, Aro Books, 2009, ISBN 978-0-9653948-3-3