KC as authorization solution and user management besides IS7 authentication?

Hi everyone. hope you can help me on that topic.

Today, i have a Authentication solution based on Identity Server 7 using a user store (on SQL Server) which contains email/password/OTP method/…).
I know that KC can do authentication + authorization and can provide its own user store.
But i wonder if i can only configure KC as authorization solution + using the existing user store.
So i keep my existing Authent solution + existing user store but leverage Authorization + admin console of KC (for permission and uer life cycle management).

Thanks for your help !