ΔE 16.9, loose: different enough that you should pick on purpose. Park Green Flat is noticeably darker, more muted than Viridian Green Hue.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Park Green Flat is noticeably darker, more muted than Viridian Green Hue.
The same difference applies the other way round: Viridian Green Hue is noticeably lighter, more saturated.
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 Viridian Green Hue on the colour wheel See Park Green Flat on the colour wheel
All matches: Viridian Green Hue equivalents · Park Green Flat equivalents