Again, it is just f-stop and magnification, but it's magnification at the point whose focus is being considered, NOT magnification at the plane of best focus. Since you can't keep all of the magnifications the same for different FsoV you get different DoF results.
You really don't.
But i'm so tired of DOF, that i can no longer find the will to explain for at least 6 months.
My fault, i know. I shouldn't have let it tempt me today.