Roger, I can only see the pics as thumbnails at the mo but if you shot the same scene(same magnification) on two different lenses and at the same aperture DoF should be the same. Does DoF look the same in the shots?

Shooting the same scene on a larger format would mean shooting at a higher magnification and reduce the DoF for the same aperture so you would need to stop down more if you wanted the same DoF.

Changing focal length and shooting at the same magnification should just change the angle of view.