Ice Yellow vs Sickly Skin

How close are they?

ΔE 8.2, close: similar, with a visible difference side by side. Sickly Skin is a little darker, cooler than Ice Yellow.

Can I use Sickly Skin instead of Ice Yellow?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Sickly Skin is a little darker, cooler than Ice Yellow.

Can I use Ice Yellow instead of Sickly Skin?

The same difference applies the other way round: Ice Yellow is a little 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.