Stock 340 springs vs comp 901-16

I was going to spring test them but I didn't want to bug the machinist. I looked at cheap spring checkers and they ain't cheap.
So I wasn' going to buy one. A free or installed height out of spec would be a test I could do myself and be an indicator.
When I ask questions I also want to know how we arrived at that answer. I may ask lots and they seem to domino lol. But I' weird in that I like math and a lot of these questions/answers boil down to math.
I do appreciate the help, I realize how much work is involved in getting the answers.
Thanks all!