ΔE 13.1, fair: the same colour family, but not a straight swap. Thousand Sons Blue is cooler than Twilight Purple.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Thousand Sons Blue is cooler than Twilight Purple.
The same difference applies the other way round: Twilight Purple is 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.
See Twilight Purple on the colour wheel See Thousand Sons Blue on the colour wheel
All matches: Twilight Purple equivalents · Thousand Sons Blue equivalents