ΔE 17.5, loose: different enough that you should pick on purpose. Lupercal Green is a little lighter, more saturated, cooler than IDF Green.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Lupercal Green is a little lighter, more saturated, cooler than IDF Green.
The same difference applies the other way round: IDF Green is a little darker, more muted, 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 IDF Green on the colour wheel See Lupercal Green on the colour wheel
All matches: IDF Green equivalents · Lupercal Green equivalents