ΔE 13.6, fair: the same colour family, but not a straight swap. Light Phthalo Green is a little lighter, cooler than Mossy Green.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Light Phthalo Green is a little lighter, cooler than Mossy Green.
The same difference applies the other way round: Mossy Green is a little darker, 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 Mossy Green on the colour wheel See Light Phthalo Green on the colour wheel
All matches: Mossy Green equivalents · Light Phthalo Green equivalents