ΔE 6.7, close: similar, with a visible difference side by side. Olive Green is a little darker, more muted than Straken Green.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Olive Green is a little darker, more muted than Straken Green.
The same difference applies the other way round: Straken Green is a little lighter, 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 Straken Green on the colour wheel See Olive Green on the colour wheel
All matches: Straken Green equivalents · Olive Green equivalents