ΔE 10.9, fair: the same colour family, but not a straight swap. Orchid Light is warmer than Faded Ultramarine.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Orchid Light is warmer than Faded Ultramarine.
The same difference applies the other way round: Faded Ultramarine is cooler.
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 Faded Ultramarine on the colour wheel See Orchid Light on the colour wheel
All matches: Faded Ultramarine equivalents · Orchid Light equivalents