ΔE 10.7, fair: the same colour family, but not a straight swap. Dark Brown RLM61 is a little darker than Darkness Grey.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Dark Brown RLM61 is a little darker than Darkness Grey.
The same difference applies the other way round: Darkness 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 Darkness Grey on the colour wheel See Dark Brown RLM61 on the colour wheel
All matches: Darkness Grey equivalents · Dark Brown RLM61 equivalents