ACS API endpoint for Custom Resources (extensions)

Hello,

I understand that we can create a new custom resource (linked to profile resource) and access it through /profileAndServicesExt or /customResources endpoints and it works fine. (Referring to this: https://experienceleague.adobe.com/docs/campaign-standard/using/working-with-apis/interacting-with-custom-resources.html?lang=en#working-with-apis)

I wanted to understand if custom resources created as "Extensions to an existing resource" like workflow, delivery can also be accessed through /customResources endpoint? (these are already linked to profile resource)

Thanks