ΔE 11.6, fair: the same colour family, but not a straight swap. Typhon Ash is noticeably lighter than Neutral Grey 43.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Typhon Ash is noticeably lighter than Neutral Grey 43.
The same difference applies the other way round: Neutral Grey 43 is noticeably darker.
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 Neutral Grey 43 on the colour wheel See Typhon Ash on the colour wheel
All matches: Neutral Grey 43 equivalents · Typhon Ash equivalents