ΔE 10.5, fair: the same colour family, but not a straight swap. Inktense Cyan is a little lighter, cooler than Omega Blue. They are different kinds of paint: Army Painter Omega Blue is an opaque base/layer paint and Scale75 Inktense Cyan is an ink, glaze or transparent paint, so they won’t behave the same on the model even where the colour is close.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Inktense Cyan is a little lighter, cooler than Omega Blue. They are different kinds of paint.
The same difference applies the other way round: Omega Blue is a little darker, 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 Omega Blue on the colour wheel See Inktense Cyan on the colour wheel
All matches: Omega Blue equivalents · Inktense Cyan equivalents