ΔE 18.2, loose: different enough that you should pick on purpose. Tan is noticeably darker, more saturated, cooler than Gnome Flesh.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 18). Tan is noticeably darker, more saturated, cooler than Gnome Flesh.
The same difference applies the other way round: Gnome Flesh is noticeably lighter, more muted, 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 Tan on the colour wheel
All matches: Gnome Flesh equivalents · Tan equivalents