A corporate oligarchy isn't a fascist state. Fascism tightly controls and regulates private businesses, trade organizations, and banking interests, and provides social programs for it's citizens (free medical care, free university level education, public health programs, universal old age pensions, etc.), and that is coupled with strong nationalism, and in the case of the German fascists, virulent racism and aggressive expansion.
Not much of that is characteristic of the emerging corporate oligarchies. They both suck, but they aren't the same.