ΔE 14.5, fair: the same colour family, but not a straight swap. Orchid Light is noticeably lighter, more saturated, cooler than Amethyst Purple.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Orchid Light is noticeably lighter, more saturated, cooler than Amethyst Purple.
The same difference applies the other way round: Amethyst Purple is noticeably darker, more muted, 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 Amethyst Purple on the colour wheel See Orchid Light on the colour wheel
All matches: Amethyst Purple equivalents · Orchid Light equivalents