ΔE 6.4, close: similar, with a visible difference side by side. Ruby Skin is more muted, cooler than Gnome Skin.
Usually, if you are not matching paint already on the model. Close match (ΔE 6). Ruby Skin is more muted, cooler than Gnome Skin.
The same difference applies the other way round: Gnome Skin is more saturated, warmer.
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.
See Gnome Skin on the colour wheel See Ruby Skin on the colour wheel
All matches: Gnome Skin equivalents · Ruby Skin equivalents