Brownish Decay vs Misted Yellow

How close are they?

ΔE 18.2, loose: different enough that you should pick on purpose. Misted Yellow is a little lighter, much more saturated, warmer than Brownish Decay.

Can I use Misted Yellow instead of Brownish Decay?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 18). Misted Yellow is a little lighter, much more saturated, warmer than Brownish Decay.

Can I use Brownish Decay instead of Misted Yellow?

The same difference applies the other way round: Brownish Decay is a little darker, much 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.