Agree with all of that. Speaking from the view of someone not of our experience (due to spending, I'd say - my experience is out of spending, not because I'm an expert - I just bought all of the stuff and tried it).

Once you're in the middle of razors, shop for stuff designed for razors (or from a pigment store that has graded pigments).

For the rest of the stuff (like the green bars), if the seller and manufacturer wasn't honest, I don't think anyone would notice anything from the microfine other than a few small scratches here and there under a scope, and a very good shave.

The other coarser compounds, though, they would have to be equated to more abrasive compounds in the dovo system, as many of them are 3 micron compounds intended to cut carving tools appreciably fast.