ΔE 15.8, loose: different enough that you should pick on purpose. IDF/IAF Green is noticeably darker, warmer than Soft Green.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). IDF/IAF Green is noticeably darker, warmer than Soft Green.
The same difference applies the other way round: Soft Green is noticeably lighter, cooler.
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 Soft Green on the colour wheel See IDF/IAF Green on the colour wheel
All matches: Soft Green equivalents · IDF/IAF Green equivalents