ΔE 11.1, fair: the same colour family, but not a straight swap. Luftwaffe Green is more saturated than Petroleum Gray.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Luftwaffe Green is more saturated than Petroleum Gray.
The same difference applies the other way round: Petroleum Gray is 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 Petroleum Gray on the colour wheel See Luftwaffe Green on the colour wheel
All matches: Petroleum Gray equivalents · Luftwaffe Green equivalents