Depends, morals and ethics are technically different things. Morality is a system of beliefs that define right and wrong action. Ethics is the study and interpretation of those systems.
The difference is a bit clearer when you compare "immoral" behavior to "unethical" behavior. Immoral behavior are actions that are clearly identified as wrong (example: murder, stealing, abuse). Unethical behavior are actions that are not wrong by themselves but can be interpreted as "bad" depending on the context.
So for example, if a school teacher has sex with his student ... that's immoral, if he gives the student an A+ in class that's unethical because there's nothing inherently wrong about giving a student an A+. It becomes wrong when we interpret the moral code.