Battle Dress Green vs Dark Yellow

How close are they?

ΔE 9.2, close: similar, with a visible difference side by side. Dark Yellow is a little lighter than Battle Dress Green.

Can I use Dark Yellow instead of Battle Dress Green?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Dark Yellow is a little lighter than Battle Dress Green.

Can I use Battle Dress Green instead of Dark Yellow?

The same difference applies the other way round: Battle Dress Green is a little darker.

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.