ΔE 19.0, loose: different enough that you should pick on purpose. Spring Green is much more saturated, warmer than Ferocious Green.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 19). Spring Green is much more saturated, warmer than Ferocious Green.
The same difference applies the other way round: Ferocious Green is much more muted, 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 Ferocious Green on the colour wheel See Spring Green on the colour wheel
All matches: Ferocious Green equivalents · Spring Green equivalents