ΔE 24.7, loose: different enough that you should pick on purpose. Gloomy Violet is a little lighter, much more saturated, warmer than Remove Mana.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 25). Gloomy Violet is a little lighter, much more saturated, warmer than Remove Mana.
The same difference applies the other way round: Remove Mana is a little darker, much 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 Remove Mana on the colour wheel See Gloomy Violet on the colour wheel
All matches: Remove Mana equivalents · Gloomy Violet equivalents