Soulstone Blue vs Cygnar Blue Highlight

How close are they?

ΔE 8.8, close: similar, with a visible difference side by side. Cygnar Blue Highlight is a little lighter than Soulstone Blue. They are different kinds of paint: Citadel Soulstone Blue is a technical paint or medium and Formula P3 Cygnar Blue Highlight is an opaque base/layer paint, so they won’t behave the same on the model even where the colour is close.

Can I use Cygnar Blue Highlight instead of Soulstone Blue?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Cygnar Blue Highlight is a little lighter than Soulstone Blue. They are different kinds of paint.

Can I use Soulstone Blue instead of Cygnar Blue Highlight?

The same difference applies the other way round: Soulstone 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.