ΔE 14.8, fair: the same colour family, but not a straight swap. J.N. Gray is a little darker, much more muted than Mossy Green.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 15). J.N. Gray is a little darker, much more muted than Mossy Green.
The same difference applies the other way round: Mossy Green is a little lighter, much 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 Mossy Green on the colour wheel See J.N. Gray on the colour wheel
All matches: Mossy Green equivalents · J.N. Gray equivalents