ΔE 10.1, fair: the same colour family, but not a straight swap. Pastel Green is more muted, cooler than Grey Green.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Pastel Green is more muted, cooler than Grey Green.
The same difference applies the other way round: Grey Green is more saturated, warmer.
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 Grey Green on the colour wheel See Pastel Green on the colour wheel
All matches: Grey Green equivalents · Pastel Green equivalents