Lava Orange vs Demon Red

How close are they?

ΔE 22.8, loose: different enough that you should pick on purpose. Demon Red is a little darker, more muted, cooler than Lava Orange.

Can I use Demon Red instead of Lava Orange?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 23). Demon Red is a little darker, more muted, cooler than Lava Orange.

Can I use Lava Orange instead of Demon Red?

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