When using the legal authorities named in the “media guidelines,” the Justice Department (DOJ) must go through a fairly stringent multi-part test (e.g. certifying that the information is critical to an investigation, that it can’t be obtained by other means, and that the DOJ exhausted all other avenues before doing so) before targeting a journalist with surveillance. They must also get approval from the Attorney General.
With the FISA court rules, there is no multi-part test that we know of. The DOJ only must follow its regular FISA court procedures (which can be less strict than getting a warrant in a criminal case) and get additional approval from the Attorney General or Assistant Attorney General. FISA court orders are also inherently secret, and targets are almost never informed that they exist.