ΔE 37.0, loose: different enough that you should pick on purpose. Brown Wash is noticeably darker, much more muted, warmer than Carroburg Crimson.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 37). Brown Wash is noticeably darker, much more muted, warmer than Carroburg Crimson.
The same difference applies the other way round: Carroburg Crimson is noticeably lighter, much 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.
See Carroburg Crimson on the colour wheel See Brown Wash on the colour wheel
All matches: Carroburg Crimson equivalents · Brown Wash equivalents