ΔE 14.8, fair: the same colour family, but not a straight swap. Royal Purple is a little darker, much more muted than Broodmother Purple.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 15). Royal Purple is a little darker, much more muted than Broodmother Purple.
The same difference applies the other way round: Broodmother Purple is a little lighter, 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 Broodmother Purple on the colour wheel See Royal Purple on the colour wheel
All matches: Broodmother Purple equivalents · Royal Purple equivalents