Slaughter Red vs Chameleon Orange

How close are they?

ΔE 19.2, loose: different enough that you should pick on purpose. Chameleon Orange is noticeably lighter, warmer than Slaughter Red.

Can I use Chameleon Orange instead of Slaughter Red?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 19). Chameleon Orange is noticeably lighter, warmer than Slaughter Red.

Can I use Slaughter Red instead of Chameleon Orange?

The same difference applies the other way round: Slaughter Red is noticeably darker, cooler.

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.