Thoughts on mixing phantom with mystic

[asplundii]

I am curious as to what differences you are seeing between the two lines are...
I have seen a difference in Purple Passion/Mystic Potions that I think is pretty consistent

It is subtle things that are, yes, mostly when seen within the rest of the BluEL group but then the same holds for the different lines of Special as well. The differences you noted between the Passions versus the Potions, also differences in the supers themselves. The tendency toward dorsal striping in the more extreme heteroallelic supers (Karma versus Lesser/Mystic, Leche versus Mocha/Mystic). There also seems to be a slightly higher degree of lateral pattern disruption in Phantom combos versus Mystic combos.

It may have more to do with the level of darkness in the mojave gene.

While I do not discount this possibility the differences I have seen extend beyond just Mojave combos so I do not think it is the sole cause

...but I no longer think that the lines in my collection are different...

If memory serves me, NERD has their own line of independently imported Phantom. I think the first PurplePassions photographed were from that line. So your speculation may have merit...