ΔE 9.7, close: similar, with a visible difference side by side. Light Phthalo Blue is a little lighter than Bright Sapphire. They are different kinds of paint: Army Painter Bright Sapphire is an opaque base/layer paint and Golden Light Phthalo Blue is an ink, glaze or transparent paint, so they won’t behave the same on the model even where the colour is close.
Usually, if you are not matching paint already on the model. Close match (ΔE 10). Light Phthalo Blue is a little lighter than Bright Sapphire. They are different kinds of paint.
The same difference applies the other way round: Bright Sapphire is a little darker.
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 Bright Sapphire on the colour wheel See Light Phthalo Blue on the colour wheel
All matches: Bright Sapphire equivalents · Light Phthalo Blue equivalents