904 vs 727?

Well I dunno in terms of tenths, never taken a vehicle down a 1/4 mile track.
I know that things like stall speed, converter diameter and probably other things factor into # of HP/ amount of torque list to just running an auto trans. But given a common, stock setup of each,
(Cuz I know that modification throws everything out the window) forget about rear gear, aerodynamics, altitude, etc for a minute,
With all else being equal (same vehicle, same gear, same tires, same driving conditions etc) just a swap between a 904 and a 727, how much difference is there? Is it a flat number of HP and torque or does it vary?
Just putzing around town, vs steady cruise on the road, vs stomping it as if to pass, etc.... There is different amounts of power available from the engine under varying conditions, but I'm thinking it still takes the same amount to pump fluid, fill the converter, keep passages within full "as necessary", under most conditions. How ever much that may be.