ΔE 5.3, very close: most people won’t see a difference side by side. Pastel Indigo is a little lighter than Matt Marine Blue. They are different kinds of paint: AMMO by Mig Matt Marine Blue is an ink, glaze or transparent paint and Army Painter Pastel Indigo is a one-coat contrast-style paint, so they won’t behave the same on the model even where the colour is close.
Yes, for most jobs. Very close match (ΔE 5). Pastel Indigo is a little lighter than Matt Marine Blue. They are different kinds of paint.
The same difference applies the other way round: Matt Marine Blue 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 Matt Marine Blue on the colour wheel See Pastel Indigo on the colour wheel
All matches: Matt Marine Blue equivalents · Pastel Indigo equivalents