[McKinsey] Difference between Delivery Assurance, McKinsey Implementation, McKinsey Operations and Orphoz

I would really appreciate it if someone could help me with the following: 

1) How do the above 4 operate/interact within McKinsey? 
-I see overlapping job titles/roles and responsibilities

2) Which of the above is a partner track?

3) What is the actual hierarchy order with names in each?
-Business Analyst/Associate/EM/AP/P -> Generalist (Integrative track)
-Delivery Consultant/Delivery Manager/Sr. Delivery Manager / Delivery Director -> ?
-Implementation Coach/Specialist/Facilitator -> ?

3) Which of these are client facing / client site / client travel roles?

4) Are these region-specific nuances?

Thank you in advance :)