White Precision Base vs Skyshard

How close are they?

ΔE 9.0, close: similar, with a visible difference side by side. Skyshard is a little darker, more saturated than White Precision Base.

Can I use Skyshard instead of White Precision Base?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Skyshard is a little darker, more saturated than White Precision Base.

Can I use White Precision Base instead of Skyshard?

The same difference applies the other way round: White Precision Base is a little lighter, 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.