ΔE 42.8, loose: different enough that you should pick on purpose. Primer Dark Neutral Grey is noticeably darker, much more muted than Waystone Green.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 43). Primer Dark Neutral Grey is noticeably darker, much more muted than Waystone Green.
The same difference applies the other way round: Waystone Green 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 Waystone Green on the colour wheel See Primer Dark Neutral Grey on the colour wheel
All matches: Waystone Green equivalents · Primer Dark Neutral Grey equivalents