ΔE 9.1, close: similar, with a visible difference side by side. Gray Green is more saturated, cooler than Worn Stone.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Gray Green is more saturated, cooler than Worn Stone.
The same difference applies the other way round: Worn Stone is more muted, 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 Worn Stone on the colour wheel See Gray Green on the colour wheel
All matches: Worn Stone equivalents · Gray Green equivalents