engine paint/brand color code ??

You have 2 choices:

Turquoise - Mopar P4120752 (Medium blue-green color)

Blue - Mopar P4349217 (Medium blue color) <<< I think this is the correct color, at least for most of them.

Both are available from most Fiat/Chrysler dealers, Summit Racing, Jegs, etc... IMHO it's good paint.