ΔE 7.1, close: similar, with a visible difference side by side. Hiril Blue is more muted, warmer than Aegis Aqua.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Hiril Blue is more muted, warmer than Aegis Aqua.
The same difference applies the other way round: Aegis Aqua is more saturated, 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 Aegis Aqua on the colour wheel See Hiril Blue on the colour wheel
All matches: Aegis Aqua equivalents · Hiril Blue equivalents