Aquatic Turquoise vs Majestic Fortress

How close are they?

ΔE 11.5, fair: the same colour family, but not a straight swap. Majestic Fortress is a little lighter, more saturated, warmer than Aquatic Turquoise.

Can I use Majestic Fortress instead of Aquatic Turquoise?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Majestic Fortress is a little lighter, more saturated, warmer than Aquatic Turquoise.

Can I use Aquatic Turquoise instead of Majestic Fortress?

The same difference applies the other way round: Aquatic Turquoise 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.