ΔE 4.4, very close: most people won’t see a difference side by side. Brown Ink is a little darker than Thondia Brown. They are different kinds of paint: Citadel Thondia Brown is an opaque base/layer paint and Reaper Brown Ink is an ink, glaze or transparent paint, so they won’t behave the same on the model even where the colour is close.
Yes, for most jobs. Very close match (ΔE 4). Brown Ink is a little darker than Thondia Brown. They are different kinds of paint.
The same difference applies the other way round: Thondia 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 Thondia Brown on the colour wheel See Brown Ink on the colour wheel
All matches: Thondia Brown equivalents · Brown Ink equivalents