IJA #30 Karekusa iro (Dry Grass) vs Khaki Brown

How close are they?

ΔE 6.6, close: similar, with a visible difference side by side. Khaki Brown is a little darker, warmer than IJA #30 Karekusa iro (Dry Grass).

Can I use Khaki Brown instead of IJA #30 Karekusa iro (Dry Grass)?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Khaki Brown is a little darker, warmer than IJA #30 Karekusa iro (Dry Grass).

Can I use IJA #30 Karekusa iro (Dry Grass) instead of Khaki Brown?

The same difference applies the other way round: IJA #30 Karekusa iro (Dry Grass) is a little lighter, 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.