Beowulf Blue vs Legacy Blue

How close are they?

ΔE 22.2, loose: different enough that you should pick on purpose. Legacy Blue is a little darker, much more muted than Beowulf Blue.

Can I use Legacy Blue instead of Beowulf Blue?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 22). Legacy Blue is a little darker, much more muted than Beowulf Blue.

Can I use Beowulf Blue instead of Legacy Blue?

The same difference applies the other way round: Beowulf Blue is a little lighter, much 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.