Arcball /orbit controls with orthogonal view

I would need to use orthogonal camera, At the moment, I don’t really understand the difference between orbit control and arcball.

I would like to link the zoom to a gui slider (zoom %)
the zoom percentage is related to min max camera camera radius. it does not seem straight using one of these 2 controls. I may need to write my own control ?

Orthographic camera with OrbitControls
You can rotate the OrbitControls, rotate the cube and change the frustumSize slider