ΔE 22.1, loose: different enough that you should pick on purpose. Gnome Flesh is noticeably lighter, much more muted, warmer than T'au Light Ochre.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 22). Gnome Flesh is noticeably lighter, much more muted, warmer than T'au Light Ochre.
The same difference applies the other way round: T'au Light Ochre is noticeably darker, much more saturated, cooler.
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 T'au Light Ochre on the colour wheel See Gnome Flesh on the colour wheel
All matches: T'au Light Ochre equivalents · Gnome Flesh equivalents