Lava Orange vs Pyrrole Orange

How close are they?

ΔE 20.2, loose: different enough that you should pick on purpose. Pyrrole Orange is a little darker, cooler than Lava Orange.

Can I use Pyrrole Orange instead of Lava Orange?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 20). Pyrrole Orange is a little darker, cooler than Lava Orange.

Can I use Lava Orange instead of Pyrrole Orange?

The same difference applies the other way round: Lava Orange is a little lighter, 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.