Vert top motor

So what's the difference?

One word answers leave much to be desired. Can you elaborate on the differences and whether or not the differences are even significant? So what is the difference, pressure, gears??

Personally, I doubt that they can't be interchanged. Currently, I own a 68, 88, and 95 vert top motor. I can't see that they wouldn't interchange. What am I missing?
 
Good ansewer ZForce,

A little more info would be great, I thought I read that someone was using an sn95 top motor for a 60's vert.
So if someone has the particular's as to why?
 
the top motors should be the same from 65-present. its a simple hydraulic pump and the same design has been used for the last 40 years.