ΔE 14.7, fair: the same colour family, but not a straight swap. White Scar is a little lighter, much more muted than Iceborn.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 15). White Scar is a little lighter, much more muted than Iceborn.
The same difference applies the other way round: Iceborn is a little darker, much 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.
See Iceborn on the colour wheel See White Scar on the colour wheel
All matches: Iceborn equivalents · White Scar equivalents