Degreeing Cam by Measuring Overlap @ Lifters

I want to see if there is a difference between the timing marks between sets. For example: if the comp cams set I am replacing with the Howards set is at a different degree of overlap when dot to dot. Not because I have to but just curious.
If the old one is worn, you might not be able to tell very much. Sprockets wear, and chains stretch...........