Checking rotation difference between two non-moving objects

Unity Engine
1

I want to tell if two objects are within say a 50 degree angle either way of each other; however, I can figure out how to do so. Below is a screenshot of what I am doing-

I want to tell when the black base is within a few degrees rotation of the white outline basically. The only thing that changes is that angle of rotation, no other angles and no movement.

2

You should be able to check it this way: Unity - Scripting API: Vector3.Angle