White Scar vs Pale Skin

How close are they?

ΔE 15.2, loose: different enough that you should pick on purpose. Pale Skin is a little darker, much more saturated than White Scar.

Can I use Pale Skin instead of White Scar?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 15). Pale Skin is a little darker, much more saturated than White Scar.

Can I use White Scar instead of Pale Skin?

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