How was an artiscoracy different than an oligarchy?

An aristocracy is a form of government where power is held by a privileged class, typically based on noble lineage, wealth, or education, emphasizing social status and hereditary rights. In contrast, an oligarchy is governed by a small group of individuals or families, often selected for their wealth, influence, or military power, without a focus on nobility or heredity. While both systems concentrate power in the hands of a few, aristocracy is more about hereditary privilege, whereas oligarchy can include any elite group, regardless of its members' backgrounds.