ΔE 7.8, close: similar, with a visible difference side by side. Gorthor Brown is more muted, warmer than Clear Smoke.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Gorthor Brown is more muted, warmer than Clear Smoke.
The same difference applies the other way round: Clear Smoke is more saturated, 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 Clear Smoke on the colour wheel See Gorthor Brown on the colour wheel
All matches: Clear Smoke equivalents · Gorthor Brown equivalents