According to the novel, in what ways might inner peace be outwardly apparent? What do Govinda and Kamala both recognize in Siddhartha that was apparent in Vasudeva and the Buddha?

I think there is a calmness and serenity about Siddhartha that can't be mistaken. He outwardly looks like he is one with the river, he is one with the energy of the world, at once diverse and at once the same. After hearing all of Siddhartha's lessons, Govinda remarks on the similarity between the Buddha and Siddhartha, and we are clearly meant to see the two as near identical at this time. There is another similarity, though, that elevates Siddhartha even more than his similarity with the Buddha. This is his similarity to the river, a more powerful similarity because the Buddha is still a man while the river is nature and life itself. When Govinda kisses the Siddhartha, he has an experience akin to that Siddhartha had at the river. What Siddhartha heard from the river, Govinda now sees in Siddhartha's face: the diversity of the world represented as a great unity.