Brownish Decay vs Ratling Grime

How close are they?

ΔE 15.0, loose: different enough that you should pick on purpose. Ratling Grime is noticeably lighter, more muted, cooler than Brownish Decay.

Can I use Ratling Grime instead of Brownish Decay?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 15). Ratling Grime is noticeably lighter, more muted, cooler than Brownish Decay.

Can I use Brownish Decay instead of Ratling Grime?

The same difference applies the other way round: Brownish Decay is noticeably darker, more saturated, 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.