ΔE 9.2, close: similar, with a visible difference side by side. Titan Green Pale is a little lighter, more muted than Grotesque Green.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Titan Green Pale is a little lighter, more muted than Grotesque Green.
The same difference applies the other way round: Grotesque Green is a little darker, more saturated.
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 Grotesque Green on the colour wheel See Titan Green Pale on the colour wheel
All matches: Grotesque Green equivalents · Titan Green Pale equivalents