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