ΔE 15.6, loose: different enough that you should pick on purpose. Intermediate Green is much more saturated, cooler than Eidolon Grey.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Intermediate Green is much more saturated, cooler than Eidolon Grey.
The same difference applies the other way round: Eidolon Grey is much more muted, 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.
See Eidolon Grey on the colour wheel See Intermediate Green on the colour wheel
All matches: Eidolon Grey equivalents · Intermediate Green equivalents