ΔE 41.6, loose: different enough that you should pick on purpose. Ink Black Green is noticeably darker, much more muted than Clear Viridian.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 42). Ink Black Green is noticeably darker, much more muted than Clear Viridian.
The same difference applies the other way round: Clear Viridian is noticeably lighter, much 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 Clear Viridian on the colour wheel See Ink Black Green on the colour wheel
All matches: Clear Viridian equivalents · Ink Black Green equivalents