Ironbreaker vs Turquoise Interference

How close are they?

ΔE 22.1, loose: different enough that you should pick on purpose. Turquoise Interference is a little lighter, much more saturated than Ironbreaker.

Can I use Turquoise Interference instead of Ironbreaker?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 22). Turquoise Interference is a little lighter, much more saturated than Ironbreaker.

Can I use Ironbreaker instead of Turquoise Interference?

The same difference applies the other way round: Ironbreaker is a little darker, much 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.