Hansa Yellow Opaque vs Moon Yellow

How close are they?

ΔE 11.0, fair: the same colour family, but not a straight swap. Moon Yellow is a little darker than Hansa Yellow Opaque.

Can I use Moon Yellow instead of Hansa Yellow Opaque?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Moon Yellow is a little darker than Hansa Yellow Opaque.

Can I use Hansa Yellow Opaque instead of Moon Yellow?

The same difference applies the other way round: Hansa Yellow Opaque is a little lighter.

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.