ΔE 6.1, close: similar, with a visible difference side by side. IJN Deep Dark Green is cooler than Field Green FS34097.
Usually, if you are not matching paint already on the model. Close match (ΔE 6). IJN Deep Dark Green is cooler than Field Green FS34097.
The same difference applies the other way round: Field Green FS34097 is 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 Field Green FS34097 on the colour wheel See IJN Deep Dark Green on the colour wheel
All matches: Field Green FS34097 equivalents · IJN Deep Dark Green equivalents