Unless you use some lens tilt or swing.
Would you not need to use more shift on a retro focus lens when using tilt or swing to bring the image back within the image circle
when using a combination of tilt/swing and shift.
I shoot mainly shallow depth of field and use tilt and swing along with shift.
With no tilt or swing I see it's the same...
Main reason whey I would go to my 4x5 rather than the Fuji gx680 if I needed a combination of tilt/swing and shift
The further a lens is from the sensor the more the image circle will be skewed by the same amount of tilt. For instance, if you are working with a symmetrical 35mm lens and you tilt it 5 degrees, in order for the center of the image circle to be in center frame, you would need to shift the back tan(5)x35mm, or 3.06mm. If the lens is a 35mm retro focal with a true focal length of say 70mm, to achieve the same thing, you would need to shift the lens tan(5)x70mm, or 6.12mm.
However, this only effects how far away the center of the image circle will be shifted from the center of frame. This will have no effect of how much you will need to shift to get the same view after the centers are lined up. This is because both lenses have the same angle of view, meaning that the same object projected through the lens in both lenses will be the same size in both of the lenses' image circles. If this was not the case, than they would not show the same angle of view.