ΔE 17.3, loose: different enough that you should pick on purpose. Chameleon Orange is noticeably lighter, warmer than Crimson.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Chameleon Orange is noticeably lighter, warmer than Crimson.
The same difference applies the other way round: Crimson 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.
See Crimson on the colour wheel See Chameleon Orange on the colour wheel
All matches: Crimson equivalents · Chameleon Orange equivalents