ΔE 6.9, 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 Dark Gull Grey FS 36231 on the colour wheel See Typhon Ash on the colour wheel
All matches: Dark Gull Grey FS 36231 equivalents · Typhon Ash equivalents