ΔE 15.7, loose: different enough that you should pick on purpose. Flat Flesh is a little lighter, warmer than Camo Sand.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Flat Flesh is a little lighter, warmer than Camo Sand.
The same difference applies the other way round: Camo Sand is a little darker, 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 Camo Sand on the colour wheel See Flat Flesh on the colour wheel
All matches: Camo Sand equivalents · Flat Flesh equivalents