ΔE 6.6, close: similar, with a visible difference side by side. Eshin Grey is a little lighter, more muted than Dark Eternal Night.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Eshin Grey is a little lighter, more muted than Dark Eternal Night.
The same difference applies the other way round: Dark Eternal Night 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 Dark Eternal Night on the colour wheel See Eshin Grey on the colour wheel
All matches: Dark Eternal Night equivalents · Eshin Grey equivalents