ΔE 7.5, close: similar, with a visible difference side by side. Thicket Grove is a little darker, cooler than Sand Grey.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Thicket Grove is a little darker, cooler than Sand Grey.
The same difference applies the other way round: Sand Grey is a little lighter, 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 Sand Grey on the colour wheel See Thicket Grove on the colour wheel
All matches: Sand Grey equivalents · Thicket Grove equivalents