ΔE 8.7, close: similar, with a visible difference side by side. Grass Color is a little lighter, more muted, cooler than Woodland Camo.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Grass Color is a little lighter, more muted, cooler than Woodland Camo.
The same difference applies the other way round: Woodland Camo is a little darker, more saturated, 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 Woodland Camo on the colour wheel See Grass Color on the colour wheel
All matches: Woodland Camo equivalents · Grass Color equivalents