Hearthborn vs Yellow FS33531

How close are they?

ΔE 10.7, fair: the same colour family, but not a straight swap. Yellow FS33531 is a little darker, cooler than Hearthborn.

Can I use Yellow FS33531 instead of Hearthborn?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Yellow FS33531 is a little darker, cooler than Hearthborn.

Can I use Hearthborn instead of Yellow FS33531?

The same difference applies the other way round: Hearthborn is a little lighter, warmer.

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.