When Apple unveiled the AirPods 3, it brought a feature to its basic earbuds that the AirPods Pro lack. In response, Apple has released a new AirPods Pro revision, allowing it and retailers to continue to charge US$249 for its 'Pro' earbuds.
https://www.notebookcheck.net/Apple-quietly-brings-the-AirPods-Pro-back-to-US-249-with-a-minor-revision-that-hints-at-an-AirPods-Pro-2-feature.575940.0.html