Night Scales vs Iron Fist

How close are they?

ΔE 36.7, loose: different enough that you should pick on purpose. Iron Fist is noticeably lighter, more muted than Night Scales.

Can I use Iron Fist instead of Night Scales?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 37). Iron Fist is noticeably lighter, more muted than Night Scales.

Can I use Night Scales instead of Iron Fist?

The same difference applies the other way round: Night Scales is noticeably darker, more saturated.

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.