ΔE 10.4, fair: the same colour family, but not a straight swap. Pacific Green is a little darker, more muted, cooler than Flat Green.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Pacific Green is a little darker, more muted, cooler than Flat Green.
The same difference applies the other way round: Flat Green is a little lighter, 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 Flat Green on the colour wheel See Pacific Green on the colour wheel
All matches: Flat Green equivalents · Pacific Green equivalents