This color swatch is a bit more accurate.
http://cdn.acrylicosvallejo.com/2d567ed91fb58cdc74108685395ac19a/CC070-Rev14.pdf
I have several VMC blues, darkblue is a tad darker but it has a nice finish. Flat blue is a medium blue tone
but it has an extremely matte finish (hence the name), I love matte colors but this one is a bit "strange". I don't have Andrea blue but
as Suzuteo said deep sky blue is very close and it's very bright and light blue. Andrea might be too vivid/bright blue except if that is what you're
looking for.