ΔE 9.6, close: similar, with a visible difference side by side. Sepia is more saturated, warmer than Banshee Brown.
Usually, if you are not matching paint already on the model. Close match (ΔE 10). Sepia is more saturated, warmer than Banshee Brown.
The same difference applies the other way round: Banshee Brown is 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 Banshee Brown on the colour wheel See Sepia on the colour wheel
All matches: Banshee Brown equivalents · Sepia equivalents