According to Osho, Charvaka is not in the same category as Shankara; it stands at the diametrically opposite pole. Where Shankara represents one extreme of the spiritual-philosophical spectrum, Charvaka embodies its counterpoint. They are opposing categories, not variations of the same type, and should be understood as polar alternatives.
No—Charvaka and Shankara are opposites, like south and north.