ΔE 7.9, close: similar, with a visible difference side by side. Midnight Purple is a little darker, warmer than Abyss Blue.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Midnight Purple is a little darker, warmer than Abyss Blue.
The same difference applies the other way round: Abyss Blue is a little lighter, 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 Abyss Blue on the colour wheel See Midnight Purple on the colour wheel
All matches: Abyss Blue equivalents · Midnight Purple equivalents