ΔE 14.0, fair: the same colour family, but not a straight swap. Green is noticeably darker, more muted than Niblet Green.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Green is noticeably darker, more muted than Niblet Green.
The same difference applies the other way round: Niblet Green is noticeably 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 Niblet Green on the colour wheel See Green on the colour wheel
All matches: Niblet Green equivalents · Green equivalents