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