ΔE 8.4, close: similar, with a visible difference side by side. Ink Sepia is a little darker than Inktense Brown.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Ink Sepia is a little darker than Inktense Brown.
The same difference applies the other way round: Inktense Brown is a little lighter.
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 Inktense Brown on the colour wheel See Ink Sepia on the colour wheel
All matches: Inktense Brown equivalents · Ink Sepia equivalents