ΔE 8.6, close: similar, with a visible difference side by side. Hemp is a little darker, more muted, warmer than Green FS 34258.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Hemp is a little darker, more muted, warmer than Green FS 34258.
The same difference applies the other way round: Green FS 34258 is a little lighter, more saturated, cooler.
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 Green FS 34258 on the colour wheel See Hemp on the colour wheel
All matches: Green FS 34258 equivalents · Hemp equivalents