The differential will be determined by the way the rider uses the foot, and sadly most people are unaware of how they use this - hence I think the data would be a bit useless.

FYI my inseam is 91.7 cm and my BB centre to seat top is 80.5 cm

My legs are at a perfect 30 degree angle when the pedal is at the bottom of the stroke, and my knee is over the pedal spindle when the pedal is at 90 degrees.

The irony of this is that I set up my seat by feel rather than a formula.