ΔE 10.8, fair: the same colour family, but not a straight swap. Military Yellow is a little darker, more saturated, warmer than Sand Grey.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Military Yellow is a little darker, more saturated, warmer than Sand Grey.
The same difference applies the other way round: Sand Grey is a little lighter, more muted, 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 Sand Grey on the colour wheel See Military Yellow on the colour wheel
All matches: Sand Grey equivalents · Military Yellow equivalents