You want me to explain it?
Or check the grammar?
An organization unit is one part of the company (organization)
Like when I worked in the bank, they also did insurance
So one business unit was banking and another was insurance.
Another one would be human resources.
Usually they do different things, but I guess sometimes they do the same things
Like reporting, risk management, etc.
So I guess you're comparing those similar functions of the business units.