Bluegrey Dusk vs Royal Purple

How close are they?

ΔE 14.7, fair: the same colour family, but not a straight swap. Royal Purple is a little lighter, more saturated, warmer than Bluegrey Dusk.

Can I use Royal Purple instead of Bluegrey Dusk?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 15). Royal Purple is a little lighter, more saturated, warmer than Bluegrey Dusk.

Can I use Bluegrey Dusk instead of Royal Purple?

The same difference applies the other way round: Bluegrey Dusk is a little darker, more muted, cooler.

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.