Most of the work is shared. The differences are narrow but real.
The short answer
SEO earns a ranking people click. AEO earns a sentence a machine repeats. The craft is largely shared: clear pages, credible sources, clean technical access. What differs is the unit of success, the measurement and how much you control.
What ranked on 18 September 2026: Results are mostly tool vendors and agency explainers. Google's own guide says no separate markup or hidden lever exists, which is the least commercial answer and the best starting point.