ΔE 15.4, loose: different enough that you should pick on purpose. Deep Yellow is noticeably darker, more muted than Cadmium Yellow Medium Hue.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 15). Deep Yellow is noticeably darker, more muted than Cadmium Yellow Medium Hue.
The same difference applies the other way round: Cadmium Yellow Medium Hue is noticeably lighter, 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 Cadmium Yellow Medium Hue on the colour wheel See Deep Yellow on the colour wheel
All matches: Cadmium Yellow Medium Hue equivalents · Deep Yellow equivalents