Primary Yellow vs Yellow Green

How close are they?

ΔE 14.7, fair: the same colour family, but not a straight swap. Yellow Green is noticeably darker, cooler than Primary Yellow.

Can I use Yellow Green instead of Primary Yellow?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 15). Yellow Green is noticeably darker, cooler than Primary Yellow.

Can I use Primary Yellow instead of Yellow Green?

The same difference applies the other way round: Primary Yellow is noticeably lighter, warmer.

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.