Yes it's the same actor who is also the subject of a biography included on the DVD:

GULPILIL: ONE RED BLOOD

Directed by Darlene Johnson (2002)

An extraordinary biography of Aboriginal actor David Gulpilil, his work and his traditional life in Arnhem Land, Northern Territory, Australia. The documentary features never-before-seen footage of sacred rituals which tribal elders permitted Johnson to film and a review of the highlights of Mr. Gulpilil's career. As a result of his role in Walkabout (1971, Nichols Roeg), no native Australian will ever again be played by a white man in blackface.