ΔE 5.9, very close: most people won’t see a difference side by side. Medium Violet is warmer than Leviathan Purple. They are different kinds of paint: Citadel Leviathan Purple is a one-coat contrast-style paint and Golden Medium Violet is an opaque base/layer 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 6). Medium Violet is warmer than Leviathan Purple. They are different kinds of paint.
The same difference applies the other way round: Leviathan Purple is 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 Leviathan Purple on the colour wheel See Medium Violet on the colour wheel
All matches: Leviathan Purple equivalents · Medium Violet equivalents