Rich results and AI Overviews draw on the same underlying signals — crawlable HTML, valid structured data, and helpful content — so a page eligible for one is usually eligible for the other, though rich results and AI Overviews are separate features with independent triggering logic.
Google's AI-features documentation is explicit that no separate opt-in gates AI Overview eligibility — the same guidelines that govern Search apply. Rich results eligibility is governed by feature-specific structured-data guides (structured-data reference).
What this means in practice: shipping FAQPage or Article markup that passes the Rich Results Test improves your chances on both surfaces at once. There is no "AI Overviews schema" — the answer engine consumes the same JSON-LD.
Two independence points. First, a page may earn a rich result without appearing in an AI Overview and vice versa; the queries that trigger each are different. Second, Google reserves the right to render or not render either surface — being eligible is not the same as being selected.
Focus effort on validity: an invalid schema block is worse than none because it can suppress a rich result that a simpler valid block would earn.