Eshin Grey vs Cryx Bane Base

How close are they?

ΔE 16.5, loose: different enough that you should pick on purpose. Cryx Bane Base is noticeably darker, more saturated than Eshin Grey.

Can I use Cryx Bane Base instead of Eshin Grey?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Cryx Bane Base is noticeably darker, more saturated than Eshin Grey.

Can I use Eshin Grey instead of Cryx Bane Base?

The same difference applies the other way round: Eshin Grey 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.