Bright Sapphire vs Steel Grey

How close are they?

ΔE 13.5, fair: the same colour family, but not a straight swap. Steel Grey is noticeably darker, more muted than Bright Sapphire.

Can I use Steel Grey instead of Bright Sapphire?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Steel Grey is noticeably darker, more muted than Bright Sapphire.

Can I use Bright Sapphire instead of Steel Grey?

The same difference applies the other way round: Bright Sapphire is noticeably lighter, more saturated.

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.