Topaz Skin vs Ruby Red

How close are they?

ΔE 7.9, close: similar, with a visible difference side by side. Ruby Red is a little darker, more saturated than Topaz Skin.

Can I use Ruby Red instead of Topaz Skin?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Ruby Red is a little darker, more saturated than Topaz Skin.

Can I use Topaz Skin instead of Ruby Red?

The same difference applies the other way round: Topaz Skin is a little lighter, more muted.

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.