ΔE 14.6, fair: the same colour family, but not a straight swap. Toxic Purple is noticeably lighter, more muted than Royal Purple.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 15). Toxic Purple is noticeably lighter, more muted than Royal Purple.
The same difference applies the other way round: Royal Purple is noticeably darker, 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 Royal Purple on the colour wheel See Toxic Purple on the colour wheel
All matches: Royal Purple equivalents · Toxic Purple equivalents