ΔE 23.8, loose: different enough that you should pick on purpose. Imperial Fist is a little lighter, more saturated, warmer than Ochre Clay.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 24). Imperial Fist is a little lighter, more saturated, warmer than Ochre Clay.
The same difference applies the other way round: Ochre Clay is a little darker, more muted, 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 Ochre Clay on the colour wheel See Imperial Fist on the colour wheel
All matches: Ochre Clay equivalents · Imperial Fist equivalents