ΔE 14.0, fair: the same colour family, but not a straight swap. Titan Buff is noticeably lighter, warmer than Zombie Flesh.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Titan Buff is noticeably lighter, warmer than Zombie Flesh.
The same difference applies the other way round: Zombie Flesh is noticeably darker, 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 Zombie Flesh on the colour wheel See Titan Buff on the colour wheel
All matches: Zombie Flesh equivalents · Titan Buff equivalents