IJA #29 Ki Midori iro (Yel- low-Green) vs Dirty Grey

How close are they?

ΔE 7.9, close: similar, with a visible difference side by side. Dirty Grey is a little lighter, more muted than IJA #29 Ki Midori iro (Yel- low-Green).

Can I use Dirty Grey instead of IJA #29 Ki Midori iro (Yel- low-Green)?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Dirty Grey is a little lighter, more muted than IJA #29 Ki Midori iro (Yel- low-Green).

Can I use IJA #29 Ki Midori iro (Yel- low-Green) instead of Dirty Grey?

The same difference applies the other way round: IJA #29 Ki Midori iro (Yel- low-Green) is a little darker, 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.