ΔE 10.7, fair: the same colour family, but not a straight swap. Pestilent Flesh is a little lighter, more saturated, cooler than Sand Grey.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Pestilent Flesh is a little lighter, more saturated, cooler than Sand Grey.
The same difference applies the other way round: Sand Grey is a little darker, 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 Sand Grey on the colour wheel See Pestilent Flesh on the colour wheel
All matches: Sand Grey equivalents · Pestilent Flesh equivalents