ΔE 18.3, loose: different enough that you should pick on purpose. Pale Grey Blue is noticeably darker, more muted than Titan Green Pale.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 18). Pale Grey Blue is noticeably darker, more muted than Titan Green Pale.
The same difference applies the other way round: Titan Green Pale 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 Titan Green Pale on the colour wheel See Pale Grey Blue on the colour wheel
All matches: Titan Green Pale equivalents · Pale Grey Blue equivalents