ΔE 10.6, fair: the same colour family, but not a straight swap. Gray Green (Luftwaffe) is a little lighter, more saturated than Crow Hue.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Gray Green (Luftwaffe) is a little lighter, more saturated than Crow Hue.
The same difference applies the other way round: Crow Hue is a little darker, more muted.
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 Crow Hue on the colour wheel See Gray Green (Luftwaffe) on the colour wheel
All matches: Crow Hue equivalents · Gray Green (Luftwaffe) equivalents