Hexed Violet vs Grey Blue

How close are they?

ΔE 23.0, loose: different enough that you should pick on purpose. Grey Blue is much more muted, cooler than Hexed Violet.

Can I use Grey Blue instead of Hexed Violet?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 23). Grey Blue is much more muted, cooler than Hexed Violet.

Can I use Hexed Violet instead of Grey Blue?

The same difference applies the other way round: Hexed Violet is much more saturated, 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.