ΔE 8.8, close: similar, with a visible difference side by side. Yellow Olive is a little lighter, more muted than Swamp Green.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Yellow Olive is a little lighter, more muted than Swamp Green.
The same difference applies the other way round: Swamp Green is a little darker, more saturated.
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 Yellow Olive on the colour wheel
All matches: Swamp Green equivalents · Yellow Olive equivalents