Silver Blade vs Amber Green

How close are they?

ΔE 38.6, loose: different enough that you should pick on purpose. Amber Green is noticeably darker, much more saturated than Silver Blade.

Can I use Amber Green instead of Silver Blade?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 39). Amber Green is noticeably darker, much more saturated than Silver Blade.

Can I use Silver Blade instead of Amber Green?

The same difference applies the other way round: Silver Blade is noticeably lighter, much more muted.

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.