Originally Posted by Road Fan

Saddle height above center of pedal spindle along seat tube,
saddle vertical height above ground,
handlebar top vertical height above ground,
Those will let you set up the saddle vertical position and the drop or rise to the handlebar.

distance from front of brake hood to point where saddle top intersects axis of seat tube,
horizontal distance from nose of saddle to a plumb line down to the BB center (bike must be level).

Also, saddle length, stem length, and handlebar reach may be useful.

This should let you transfer contact point locations from bike to bike.

I hope I haven't gone overboard.