b body wiper motor crank pin

i have a 2822273 3 speed crank pin and a 2580934 crank pin that has veri speed on it,does veri speed mean it is for a three speed wiper motor? the veri speed pin has a lot longer slot at the end than the 2822273 pin is there any difference?thanks

The "273" P/N is for 69-70 b-body and the "934" is for 66-68 b bodies