Is there a document or materials for me to understand reporting hierarchy within the organization?

I am designing a platform for CEO to compare reporting hierarchy from last year to today so he can see the employee changes in the company.

Here is the use case..

MJ is a CEO at ACME. ACME recently went through massive changes in the internal organizational Structure. Some employees were promoted, some had left, some were hired, some moved Departments, while others remained in the same position. MJ wants to compare the reporting hierarchy from last year to today so he can see the employee changes in the company.

Acceptance Criteria • Side-by-side comparison view of the two hierarchies to easily compare. • Have a way for the user to quickly know the changes between the two hierarchies: promotions, Resignation, new hires. • Have a way for the user to search for an employee and view its location within both hierarchies.

Non-functional requirements • ACME currently has 2000+ employees • ACME’s reporting structure is at most 5 levels deep

Please let me know if there are any similar concept available in the industry or you guys can feed me in with your thoughts..