Grey-Blue vs Baharroth Blue

How close are they?

ΔE 16.7, loose: different enough that you should pick on purpose. Baharroth Blue is a little darker, much more saturated, cooler than Grey-Blue.

Can I use Baharroth Blue instead of Grey-Blue?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Baharroth Blue is a little darker, much more saturated, cooler than Grey-Blue.

Can I use Grey-Blue instead of Baharroth Blue?

The same difference applies the other way round: Grey-Blue is a little lighter, much more muted, 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.