From the heading, it is implied that the author at least believes that there is a difference. The distinction between the two lies principally in the issue of enforcement. In contrast, a Code of Conduct is a list of prescriptions, to each of which is normally attached a penalty if violated. Conduct says this is how you MUST behave. It is a form of law.
Ethics is about choice.
Without the freedom to choose, it is not ethics but law. It is also true that the prescription within a Code of Conduct needs the foundation supplied by a code of ethics, whether this is posited or implied. Of course this is not to say that a Code of Conduct can not be useful, indeed they are often invaluable. However the first step is to articulate core values and wider principles. These help guide the interpretation of a Code of Conduct, and assist where the Code of Conduct is silent or ambiguous.