ΔE 47.4, loose: different enough that you should pick on purpose. Atramentum Black is a little darker, much more muted than Berserker Bloodshade.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 47). Atramentum Black is a little darker, much more muted than Berserker Bloodshade.
The same difference applies the other way round: Berserker Bloodshade is a little lighter, much more saturated.
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 Berserker Bloodshade on the colour wheel See Atramentum Black on the colour wheel
All matches: Berserker Bloodshade equivalents · Atramentum Black equivalents