Rear Coil Spring Differences

[ThreeQuarter]

My C10 came with the G50 HD Rear Spring option, which is a heavier variable-rate spring vs. the standard constant-rate option. I installed a new set of these variable-rate springs when I restored it. But now I'm thinking about swapping these out with standard rear springs. I can speculate about what it might be like, but I'm really interested in anyone's lived experience comparing these two springs (stock height):

1) I read a very old thread here that said this G50 variable rate spring option will make the rear sit higher than the standard rear spring (unloaded). Is that true? If so, how much?

2) When driving my LWB around empty, should I expect to notice a difference in ride quality between the G50 variable rate springs and a set of standard springs? In other words, is there much difference between the softer end of the variable rate springs and the constant rate of the standard springs?