ΔE 7.1, close: similar, with a visible difference side by side. Basic Skin Tone is a little darker, cooler than Gnome Flesh.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Basic Skin Tone is a little darker, cooler than Gnome Flesh.
The same difference applies the other way round: Gnome Flesh is a little lighter, 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 Flesh on the colour wheel See Basic Skin Tone on the colour wheel
All matches: Gnome Flesh equivalents · Basic Skin Tone equivalents