Iron Warriors vs Heavy Armour

How close are they?

ΔE 19.4, loose: different enough that you should pick on purpose. Heavy Armour is noticeably darker, more muted than Iron Warriors.

Can I use Heavy Armour instead of Iron Warriors?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 19). Heavy Armour is noticeably darker, more muted than Iron Warriors.

Can I use Iron Warriors instead of Heavy Armour?

The same difference applies the other way round: Iron Warriors is noticeably lighter, 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.