[Baron Von Zeppelin]

I don't think there even is a color standard for "Carolina Blue".
Anything close in that shade usually gets re-named that , at least in NC.
Even Baby Blue isn't called Baby Blue anymore, its Carolina Blue
powder blue, sky blue, etc ... all get the Carolina reference.
They'll grab anything that is that shade of blue.

But that 66 Caddy color is a great representative.
The NC Dealers probably did rename it as an extra part of the sales pitch.

64 Pontiac had a Skyline Blue that was close, but paler.
69 or 70 Chevy/GMC trucks had a similar blue.

iirc , Nick Nolte drove a 66 Mist Blue Caddy Vert in Beverly Hills Cop movie with Eddy Murphy.

There was a 66 GTO special paint car in my hometown for a long time, it was the 66 Caddy color.
But everyone called it a Carolina Blue GTO.
It looked good in that color too. I almost bought it , but it was a bit raggedy by that time.