Stone Grey vs Cryx Bane Highlight

How close are they?

ΔE 17.1, loose: different enough that you should pick on purpose. Cryx Bane Highlight is noticeably darker, cooler than Stone Grey.

Can I use Cryx Bane Highlight instead of Stone Grey?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Cryx Bane Highlight is noticeably darker, cooler than Stone Grey.

Can I use Stone Grey instead of Cryx Bane Highlight?

The same difference applies the other way round: Stone Grey is noticeably lighter, warmer.

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.