Balor Brown vs Kiwi Brown

How close are they?

ΔE 6.4, close: similar, with a visible difference side by side. Kiwi Brown is more muted than Balor Brown.

Can I use Kiwi Brown instead of Balor Brown?

Usually, if you are not matching paint already on the model. Close match (ΔE 6). Kiwi Brown is more muted than Balor Brown.

Can I use Balor Brown instead of Kiwi Brown?

The same difference applies the other way round: Balor Brown is more saturated.

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.