ΔE 21.1, loose: different enough that you should pick on purpose. Ice Yellow is noticeably lighter, much more muted than Ambush Yellow.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 21). Ice Yellow is noticeably lighter, much more muted than Ambush Yellow.
The same difference applies the other way round: Ambush Yellow is noticeably darker, 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 Ambush Yellow on the colour wheel See Ice Yellow on the colour wheel
All matches: Ambush Yellow equivalents · Ice Yellow equivalents