ΔE 18.6, loose: different enough that you should pick on purpose. Silver Grey is a little lighter, much more muted, cooler than Stegadon Scale Green.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 19). Silver Grey is a little lighter, much more muted, cooler than Stegadon Scale Green.
The same difference applies the other way round: Stegadon Scale Green is a little darker, much more saturated, 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 Stegadon Scale Green on the colour wheel See Silver Grey on the colour wheel
All matches: Stegadon Scale Green equivalents · Silver Grey equivalents