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If the Ecell is the same, the substance that is oxidized/reduced will depend on the concentration. The substance in lower concentration will be oxidized, while the substance present in higher concentration will usually be reduced.
Since the Ecell values are given under standard conditions, you would also have to take into account other factors such as the concentrations of the cathode and anode, as well as the temperature. The anode (oxidation reaction) will occur at the lower concentration of substrates, while the cathode (reduction reaction) will occur at the higher concentration of substrates.
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