ΔE 11.5, fair: the same colour family, but not a straight swap. Obsidian Pigment Toner is a little darker, more muted than Ocean Blue.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Obsidian Pigment Toner is a little darker, more muted than Ocean Blue.
The same difference applies the other way round: Ocean Blue is a little lighter, more saturated.
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 Ocean Blue on the colour wheel See Obsidian Pigment Toner on the colour wheel
All matches: Ocean Blue equivalents · Obsidian Pigment Toner equivalents