ΔE 10.4, fair: the same colour family, but not a straight swap. Terrestrial Titan is more muted, cooler than Dark Violet.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Terrestrial Titan is more muted, cooler than Dark Violet.
The same difference applies the other way round: Dark Violet is more saturated, 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 Dark Violet on the colour wheel See Terrestrial Titan on the colour wheel
All matches: Dark Violet equivalents · Terrestrial Titan equivalents