ΔE 7.6, close: similar, with a visible difference side by side. Middle Stone is a little lighter, more saturated, warmer than Thicket Grove.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Middle Stone is a little lighter, more saturated, warmer than Thicket Grove.
The same difference applies the other way round: Thicket Grove is a little darker, 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 Thicket Grove on the colour wheel See Middle Stone on the colour wheel
All matches: Thicket Grove equivalents · Middle Stone equivalents