I was in the same boat as you a few years ago,but there are a few ways to tell the diffrence between the two. The first is have a side by comparison this makes it pretty obvious that there's "a little something extra" in one of the snakes. If that's not possible look at the blushing on the Lesser pastel my LP has insane blushing.Lesser pastels should also have more yellow to them than a regular lesser.These things vary from snake to snake but that's at least a start.I would post some pics but I'm like 500miles from my computer,try checking out the morphs section on NERD's site.