Pastel Seafoam vs Undead Dragon

How close are they?

ΔE 11.6, fair: the same colour family, but not a straight swap. Undead Dragon is a little darker, more muted, warmer than Pastel Seafoam.

Can I use Undead Dragon instead of Pastel Seafoam?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Undead Dragon is a little darker, more muted, warmer than Pastel Seafoam.

Can I use Pastel Seafoam instead of Undead Dragon?

The same difference applies the other way round: Pastel Seafoam is a little lighter, more saturated, 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.