ΔE 14.9, fair: the same colour family, but not a straight swap. Orchid Light is a little lighter, warmer than Deep Cobalt Blue.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 15). Orchid Light is a little lighter, warmer than Deep Cobalt Blue.
The same difference applies the other way round: Deep Cobalt Blue is a little darker, 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 Deep Cobalt Blue on the colour wheel See Orchid Light on the colour wheel
All matches: Deep Cobalt Blue equivalents · Orchid Light equivalents