What is the difference between legal and law related?

It really depends on what the issue is, basically law related would be anything used in legal procedures, "legal" would refer to the actual application of the law. For example a licensed attorney is a legal practioner of the law, a paralegal cannot practice law but works in law related areas such as interviewing witnesses, taking depositions, drafting legal documents and so forth. An attorney is responsible for the legality and accuracy of all work done by their legal assistants/paralegals.