Green vs Dark Yellow

How close are they?

ΔE 13.3, fair: the same colour family, but not a straight swap. Dark Yellow is a little lighter, more saturated than Green.

Can I use Dark Yellow instead of Green?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Dark Yellow is a little lighter, more saturated than Green.

Can I use Green instead of Dark Yellow?

The same difference applies the other way round: Green is a little darker, more muted.

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.