ΔE 11.0, fair: the same colour family, but not a straight swap. Shyish Purple is a little lighter, more muted than Purple Swarm.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Shyish Purple is a little lighter, more muted than Purple Swarm.
The same difference applies the other way round: Purple Swarm is a little 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 Purple Swarm on the colour wheel See Shyish Purple on the colour wheel
All matches: Purple Swarm equivalents · Shyish Purple equivalents