ΔE 19.3, loose: different enough that you should pick on purpose. Silver is noticeably darker than Iridescent Silver (Fine). They are different kinds of paint: Golden Iridescent Silver (Fine) is a pearl paint and Vallejo Silver is a metallic, so they won’t behave the same on the model even where the colour is close.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 19). Silver is noticeably darker than Iridescent Silver (Fine). They are different kinds of paint.
The same difference applies the other way round: Iridescent Silver (Fine) is noticeably lighter.
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 Iridescent Silver (Fine) on the colour wheel See Silver on the colour wheel
All matches: Iridescent Silver (Fine) equivalents · Silver equivalents