ΔE 6.7, close: similar, with a visible difference side by side. Our swatches for the two are almost the same.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). The swatches are almost the same.
The same difference applies the other way round.
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 RAF Camouflage (Barley) Grey BS381C/626 on the colour wheel See Grey Castle on the colour wheel
All matches: RAF Camouflage (Barley) Grey BS381C/626 equivalents · Grey Castle equivalents