ΔE 11.5, fair: the same colour family, but not a straight swap. Pastel Green is a little darker, more muted than Pacific Green.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Pastel Green is a little darker, more muted than Pacific Green.
The same difference applies the other way round: Pacific Green is a little lighter, 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 Pacific Green on the colour wheel See Pastel Green on the colour wheel
All matches: Pacific Green equivalents · Pastel Green equivalents