Is there any difference at all between the formulation of a soap puck or stick from the same manufacturer? I somehow got under the impression that sticks were somehow formulated (more water?) to be softer, but I'm not really sure if that's true. Also, I don't currently have both a stick and a puck from the same manufacturer to compare directly, but I seem to recall that the Tabac puck is a different color from the Tabac stick I currently have. Can anyone shed some light on this for me?