Calgar Blue vs Cygnar Blue Highlight

How close are they?

ΔE 7.6, close: similar, with a visible difference side by side. Cygnar Blue Highlight is a little lighter than Calgar Blue.

Can I use Cygnar Blue Highlight instead of Calgar Blue?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Cygnar Blue Highlight is a little lighter than Calgar Blue.

Can I use Calgar Blue instead of Cygnar Blue Highlight?

The same difference applies the other way round: Calgar Blue is a little darker.

ΔE is the colour difference between our two swatch estimates: under about 6 is close, over about 15 is loose. Real paints also differ in finish, coverage and how they thin, so test before you commit.