I want to say of course they are the same. Work=Force x Distance. But then there is that voice in the back of my head that makes me question, in this particular example, whether that's right.
So working backwards from the brake pad, whats the unit area of the pad? Both styles of calipers are the ~same. That means the force for the floating caliper is the same as a fixed. My money, fixed caliper needs 2X the area of the floater.