Flesh Tearers Red vs Ruby Red

How close are they?

ΔE 23.7, loose: different enough that you should pick on purpose. Ruby Red is much more muted than Flesh Tearers Red. They are different kinds of paint: Citadel Flesh Tearers Red is a one-coat contrast-style paint and Nocturna Models Ruby Red 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 Ruby Red instead of Flesh Tearers Red?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 24). Ruby Red is much more muted than Flesh Tearers Red. They are different kinds of paint.

Can I use Flesh Tearers Red instead of Ruby Red?

The same difference applies the other way round: Flesh Tearers Red is much more saturated.

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.