ΔE 16.5, loose: different enough that you should pick on purpose. Yellow Green is a little darker, cooler than Hansa Yellow Opaque.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Yellow Green is a little darker, cooler than Hansa Yellow Opaque.
The same difference applies the other way round: Hansa Yellow Opaque is a little lighter, 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 Hansa Yellow Opaque on the colour wheel See Yellow Green on the colour wheel
All matches: Hansa Yellow Opaque equivalents · Yellow Green equivalents