ΔE 10.4, fair: the same colour family, but not a straight swap. Terrestrial Titan is more muted, cooler than Space Purple.
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 Space Purple.
The same difference applies the other way round: Space Purple 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 Space Purple on the colour wheel See Terrestrial Titan on the colour wheel
All matches: Space Purple equivalents · Terrestrial Titan equivalents