ΔE 9.8, close: similar, with a visible difference side by side. Luftwaffe Green is a little lighter, more saturated, cooler than Swamp Green.
Usually, if you are not matching paint already on the model. Close match (ΔE 10). Luftwaffe Green is a little lighter, more saturated, cooler than Swamp Green.
The same difference applies the other way round: Swamp Green is a little darker, 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 Swamp Green on the colour wheel See Luftwaffe Green on the colour wheel
All matches: Swamp Green equivalents · Luftwaffe Green equivalents