Are you kidding?
Sorry, I could not resist!
I don't know of an "official story" other than the website itself. Clearly, however, "Abyss" refers to the darker of the two blues. HD has always been very clever in naming its colors. it is all marketing, after all
The reason I said that is because the HD website kinda makes it
look that way, because they seem to say the "top" or main body color first and the stripe/accent color second, like the Autumn Sunset and the Typhoon Maroon seem to clearly be the strip colors on the other two models and not the main body colors. See this link:
http://www.harley-davidson.com/en_US/Motorcycles/cvo-road-glide-ultra.html#!pnw and pay special attention to the color chits and the order the colors are mentioned. And by the way, I appreciate you taking the time to show us a Behr color chart, but that's house paint and like you say, who knows how clever HD is trying to be!

Hey, there ain't much activity on the forum this morning so I was trying to stir it up a little, ya know? Generate some interest or somethin! Heck it's raining here and not much fun so I posted something a little different!

I know it isn't a huge deal, but I'd kinda like to know which is which for sure...wouldn't you?