Tuskgor Fur vs Brown

How close are they?

ΔE 19.4, loose: different enough that you should pick on purpose. Brown is noticeably darker, much more muted, cooler than Tuskgor Fur.

Can I use Brown instead of Tuskgor Fur?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 19). Brown is noticeably darker, much more muted, cooler than Tuskgor Fur.

Can I use Tuskgor Fur instead of Brown?

The same difference applies the other way round: Tuskgor Fur is noticeably lighter, much 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.