Sunny Yellow vs Light Yellow

How close are they?

ΔE 10.5, fair: the same colour family, but not a straight swap. Light Yellow is a little darker, more muted than Sunny Yellow.

Can I use Light Yellow instead of Sunny Yellow?

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

Can I use Sunny Yellow instead of Light Yellow?

The same difference applies the other way round: Sunny Yellow is a little lighter, 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.