Wrack White vs White FS17875

How close are they?

ΔE 9.2, close: similar, with a visible difference side by side. White FS17875 is a little lighter, more muted than Wrack White.

Can I use White FS17875 instead of Wrack White?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). White FS17875 is a little lighter, more muted than Wrack White.

Can I use Wrack White instead of White FS17875?

The same difference applies the other way round: Wrack White is a little darker, 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.