ΔE 13.4, fair: the same colour family, but not a straight swap. Desert Tan is more saturated, cooler than Deck Grey.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Desert Tan is more saturated, cooler than Deck Grey.
The same difference applies the other way round: Deck Grey is 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 Deck Grey on the colour wheel See Desert Tan on the colour wheel
All matches: Deck Grey equivalents · Desert Tan equivalents