ΔE 15.8, loose: different enough that you should pick on purpose. Bright Green is a little darker, much more muted, warmer than Intermediate Green.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Bright Green is a little darker, much more muted, warmer than Intermediate Green.
The same difference applies the other way round: Intermediate Green is a little lighter, much more saturated, 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 Intermediate Green on the colour wheel See Bright Green on the colour wheel
All matches: Intermediate Green equivalents · Bright Green equivalents