ΔE 9.8, close: similar, with a visible difference side by side. Transparent Phthalo Green (Blue Shade) is a little lighter, more saturated, warmer than Aqua Alchemy. They are different kinds of paint: Army Painter Aqua Alchemy is an opaque base/layer paint and Golden Transparent Phthalo Green (Blue Shade) 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). Transparent Phthalo Green (Blue Shade) is a little lighter, more saturated, warmer than Aqua Alchemy. They are different kinds of paint.
The same difference applies the other way round: Aqua Alchemy is a little darker, more muted, 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 Aqua Alchemy on the colour wheel See Transparent Phthalo Green (Blue Shade) on the colour wheel
All matches: Aqua Alchemy equivalents · Transparent Phthalo Green (Blue Shade) equivalents