ΔE 10.7, fair: the same colour family, but not a straight swap. Inktense Chestnut is more saturated, warmer than Ruddy Terra. They are different kinds of paint: Army Painter Ruddy Terra is an opaque base/layer paint and Scale75 Inktense Chestnut is an ink, glaze or transparent paint, so they won’t behave the same on the model even where the colour is close.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Inktense Chestnut is more saturated, warmer than Ruddy Terra. They are different kinds of paint.
The same difference applies the other way round: Ruddy Terra 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 Ruddy Terra on the colour wheel See Inktense Chestnut on the colour wheel
All matches: Ruddy Terra equivalents · Inktense Chestnut equivalents