ΔE 10.6, fair: the same colour family, but not a straight swap. Riff Green is a little darker, more saturated than Eshin Grey.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Riff Green is a little darker, more saturated than Eshin Grey.
The same difference applies the other way round: Eshin Grey is a little lighter, more muted.
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 Riff Green on the colour wheel
All matches: Eshin Grey equivalents · Riff Green equivalents