Right, I am saying some of the stuff you have posted is a little bit confusing as far as terminology.This article does a good job breaking down the difference.
AccuTune Off-Road’s Experience: Our Founder and author of this article, Ryan Raker, has been designing, tuning, and manufacturing shocks with digressive, linear and progressive damping curves since 2001. During that time he used state of the art shock dyno’s to design and/or tune premium shocks...accutuneoffroad.com
The Accutune article is spot on, they know their stuff. I worked with Ryan on a set of shocks for my last project.