Fur Brown vs Amethyst Rose

How close are they?

ΔE 17.3, loose: different enough that you should pick on purpose. Amethyst Rose is noticeably darker, more saturated than Fur Brown.

Can I use Amethyst Rose instead of Fur Brown?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Amethyst Rose is noticeably darker, more saturated than Fur Brown.

Can I use Fur Brown instead of Amethyst Rose?

The same difference applies the other way round: Fur Brown is noticeably lighter, more muted.

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.