Runelord Brass vs Amber Alchemy

How close are they?

ΔE 22.0, loose: different enough that you should pick on purpose. Amber Alchemy is noticeably lighter, warmer than Runelord Brass.

Can I use Amber Alchemy instead of Runelord Brass?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 22). Amber Alchemy is noticeably lighter, warmer than Runelord Brass.

Can I use Runelord Brass instead of Amber Alchemy?

The same difference applies the other way round: Runelord Brass is noticeably darker, 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.