ΔE 21.2, loose: different enough that you should pick on purpose. Cobalt Violet Hue is noticeably darker, more saturated, warmer than Moody Mauve. They are different kinds of paint: Army Painter Moody Mauve is a one-coat contrast-style paint and Golden Cobalt Violet Hue is an opaque base/layer paint, so they won’t behave the same on the model even where the colour is close.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 21). Cobalt Violet Hue is noticeably darker, more saturated, warmer than Moody Mauve. They are different kinds of paint.
The same difference applies the other way round: Moody Mauve is noticeably lighter, 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 Moody Mauve on the colour wheel See Cobalt Violet Hue on the colour wheel
All matches: Moody Mauve equivalents · Cobalt Violet Hue equivalents