Historically, we used different saved filter IDs for Pages and Answers. For example, in Page Builder, you used to use the filter ID found in the url in Knowledge Graph or by inspecting the page.
Starting now, all saved filter IDs for both products use the Saved Filter ID you can find in Account Settings.
In Page Builder, you can use this saved filter to limit entities returned in modules like the Nearby Locations module:
In Answers, you can use it in your Search Configuration to limit entities returned for a given vertical:
To learn more about Saved Filters, you can go to: