Carroburg Crimson vs Dark Shade

How close are they?

ΔE 23.6, loose: different enough that you should pick on purpose. Dark Shade is a little darker, much more muted, warmer than Carroburg Crimson.

Can I use Dark Shade instead of Carroburg Crimson?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 24). Dark Shade is a little darker, much more muted, warmer than Carroburg Crimson.

Can I use Carroburg Crimson instead of Dark Shade?

The same difference applies the other way round: Carroburg Crimson is a little 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.