Difference in length between steel CV shaft and Aluminum Marauder/Cop shaft

[Stranger in the Black Sedan]

Hi guys, I came across an interesting piece of trivia on this site the other day -- I never knew the aluminum cop/MM drive shaft is shorter than the base model steel crown vic and marquis shafts.

I assume they use the same U joints and yokes? Does anyone know what the EXACT difference in length is between the steel/aluminum driveshafts?