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