Power BI Client app and REST API

Hello community,

If I register a client app on this site:

https://powerbi.microsoft.com/en-us/documentation/powerbi-developer-register-a-client-app/#clientTool

I'm using the Power BI Rest API.

Is this the same with Power BI embedded?

https://azure.microsoft.com/de-de/pricing/details/power-bi-embedded/

If I use the first link, in Azure AD I can't find Power BI Service, only Power BI, is this the same?

Thanks in advance!!