ΔE 21.0, loose: different enough that you should pick on purpose. Primer Dark Neutral Grey is a little darker, much more muted than Typhus Corrosion.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 21). Primer Dark Neutral Grey is a little darker, much more muted than Typhus Corrosion.
The same difference applies the other way round: Typhus Corrosion 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 Typhus Corrosion on the colour wheel See Primer Dark Neutral Grey on the colour wheel
All matches: Typhus Corrosion equivalents · Primer Dark Neutral Grey equivalents