ΔE 25.0, loose: different enough that you should pick on purpose. Berserker Bloodshade is noticeably lighter, much more saturated, warmer than Dark Red Tone.
✓ Army Painter Fanatic conversion chart lists these two as equivalents.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 25). Berserker Bloodshade is noticeably lighter, much more saturated, warmer than Dark Red Tone.
The same difference applies the other way round: Dark Red Tone is noticeably 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 Dark Red Tone on the colour wheel See Berserker Bloodshade on the colour wheel
All matches: Dark Red Tone equivalents · Berserker Bloodshade equivalents