ΔE 9.4, close: similar, with a visible difference side by side. Dark Brown RLM61 is a little darker than Eshin Grey.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Dark Brown RLM61 is a little darker than Eshin Grey.
The same difference applies the other way round: Eshin Grey is a little lighter.
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 Eshin Grey on the colour wheel See Dark Brown RLM61 on the colour wheel
All matches: Eshin Grey equivalents · Dark Brown RLM61 equivalents