ΔE 4.8, very close: most people won’t see a difference side by side. Lupercal Green is a little darker, cooler than Phtalo Green.
Yes, for most jobs. Very close match (ΔE 5). Lupercal Green is a little darker, cooler than Phtalo Green.
The same difference applies the other way round: Phtalo Green is a little lighter, 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 Phtalo Green on the colour wheel See Lupercal Green on the colour wheel
All matches: Phtalo Green equivalents · Lupercal Green equivalents