ΔE 10.0, fair: the same colour family, but not a straight swap. Red Grey is a little darker, cooler than Paratrooper Tan.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Red Grey is a little darker, cooler than Paratrooper Tan.
The same difference applies the other way round: Paratrooper Tan is a little lighter, 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 Paratrooper Tan on the colour wheel See Red Grey on the colour wheel
All matches: Paratrooper Tan equivalents · Red Grey equivalents