Difference between integration Apps from Zoom and third-party

[katsugl]

Hi, I'm wondering what is the difference between integration Apps from Zoom and third-party. Actually, I'm trying to integrate Zoom webinar and Hubspot MA. Then, there are marketplaces and integrations Apps on both of their software ("Zoom for HubSpot" on Zoom marketprace and "Zoom" on Hubspot marketplace). I have not been able to resolve the following questions.

・Are there any difference between two Apps?(technically)

If there is difference...

・What function does the Zoom Apps actually perform?

・What function does the Hubspot Apps actually perform?

・Do I need to install both?

・If we want to develop integration Apps with zoom, we need to place Apps on Zoom marketplace? or can we develop integration App without permission?