Typhon Ash vs Evil Flesh

How close are they?

ΔE 15.2, loose: different enough that you should pick on purpose. Evil Flesh is noticeably darker, more saturated than Typhon Ash.

Can I use Evil Flesh instead of Typhon Ash?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 15). Evil Flesh is noticeably darker, more saturated than Typhon Ash.

Can I use Typhon Ash instead of Evil Flesh?

The same difference applies the other way round: Typhon Ash is noticeably lighter, more muted.

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.