ΔE 13.4, fair: the same colour family, but not a straight swap. Orchid Light is much more saturated than Runic Purple.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Orchid Light is much more saturated than Runic Purple.
The same difference applies the other way round: Runic Purple is much more muted.
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 Runic Purple on the colour wheel See Orchid Light on the colour wheel
All matches: Runic Purple equivalents · Orchid Light equivalents