@eg1995 Thank you for reaching out to us, As I understand you would like to know product capabilities in mix environment (defender for business & defender for endpoint P1).
Similar point has been discussed here with a different example - https://review.learn.microsoft.com/en-us/microsoft-365/security/defender-business/mdb-faq?view=o365-worldwide&branch=main#:~:text=and%202.-,What%20happens%20if%20I%20have%20a%20mix%20of%20Microsoft%20endpoint%20security%20subscriptions%3F,-Suppose%20you%20have
Let me know if you have any further questions, feel free to post back.
Please remember to "Accept Answer" if answer helped, so that others in the community facing similar issues can easily find the solution.