Typhon Ash vs Silver Grey

How close are they?

ΔE 19.7, loose: different enough that you should pick on purpose. Silver Grey is noticeably darker, more saturated than Typhon Ash.

Can I use Silver Grey instead of Typhon Ash?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 20). Silver Grey is noticeably darker, more saturated than Typhon Ash.

Can I use Typhon Ash instead of Silver Grey?

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.