Once you approve a permission request from an SPFx app, it will grant the same permission to all other apps in the same tenant.
Nothing new, but I want to emphasize that in that blog post only dedicated to that. You can read it here:
A simple sketch over the permissions.
Here is a simple FAQ to explain what it means:
- I uploaded my app to two site collection app catalogs. Do I need to get approval for the app twice? – No.
- I have got my approval for Delegated Groups.ReadWrite.All for App X. Now I want to use the same permissions in another app, do I need a new approval? – No.