Use multiple providers seperately

[KobeTwo]

We would like control access to our test site (nextjs) with NextAuth and provider Azure Active Directory. All employees of our company have an account there.
In addition, we would like to use NextAuth to handle the login of our demo accounts (custom OAuth Provider) in this test site.
So we have completely separated process. One restricting complete access to the site with employee user base and the other restricting only the access to certain site parts with another user base.
Is that possible to achieve with NextAuth?