There do seem to be differences. Maybe:

1) Differences in the none itself (enantiomers or blends??)
2) Differences in manufacturing byproducts (maybe the byproducts are active or suppressive?)
3) Differences in carrier (alcohol vs. oil makes a difference in delivery)

I use Stone none in mixes when I want to stay below the scent radar. But Andro4.2 seems good as standalone. It smells richer and different than Stone, even after the harsher alcohol smell dies down. Blatant hits with Ando4.2 - really good stuff.