In the spirit of careful precision, this distinction as articulated by Nelson Maldonado-Torres:
Coloniality is different from colonialism. Colonialism denotes a political and economic relation in which the sovereignty of a nation or a people rests on the power of another nation, which makes such nation an empire. Coloniality, instead, refers to long-standing patterns of power that emerged as a result of colonialism, but that define culture, labour, intersubjective relations, and knowledge production well beyond the strict limits of colonial administrations. Thus, coloniality survives colonialism. It is maintained alive in books, in the criteria for academic performance, in cultural patterns, in common sense, in the self-image of peoples, in aspirations of self, and so many other aspects of our modern experience. In a way, as modern subjects we breath coloniality all the time and everyday.
We are all students and subjects of coloniality. So what are we gonna do about it?
And what happens to sovereignty when it rests upon an empire, both to the colonizing nation and the colonized state? Is sovereignty diluted or made stronger when set in relation to patterns of oppression?