Royal Robes vs Cygnar Blue Highlight

How close are they?

ΔE 7.5, close: similar, with a visible difference side by side. Cygnar Blue Highlight is a little lighter than Royal Robes. They are different kinds of paint: Army Painter Royal Robes is a one-coat contrast-style paint 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 Royal Robes?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Cygnar Blue Highlight is a little lighter than Royal Robes. They are different kinds of paint.

Can I use Royal Robes instead of Cygnar Blue Highlight?

The same difference applies the other way round: Royal Robes 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.