ΔE 19.8, loose: different enough that you should pick on purpose. Earth Green (Early) is a little lighter, much more saturated, warmer than Viridian Grim.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 20). Earth Green (Early) is a little lighter, much more saturated, warmer than Viridian Grim.
The same difference applies the other way round: Viridian Grim is a little darker, 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 Viridian Grim on the colour wheel See Earth Green (Early) on the colour wheel
All matches: Viridian Grim equivalents · Earth Green (Early) equivalents