ΔE 13.2, fair: the same colour family, but not a straight swap. Luftwaffe Green is more muted, cooler than Olive Shadow.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Luftwaffe Green is more muted, cooler than Olive Shadow.
The same difference applies the other way round: Olive Shadow is more saturated, 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 Olive Shadow on the colour wheel See Luftwaffe Green on the colour wheel
All matches: Olive Shadow equivalents · Luftwaffe Green equivalents