Is it just because they do not do experiments the journalists are different from the academic researchers who too gather information and analyze results (stories)?
Investigative journalists may have some component of research in their work. Most other journalists may be just reporting the event, news, story, etc., with some innovative effects to make their write-up palatable to masses.
If you're considering only the concept of science of the 19th Century, then I'm afraid you cannot consider a lot of people who work in the Humanities an academic researcher. However, based on a modern notion of science, it is possible to produce knowledge through other methods than only with experiments.
Which type of researchers and journalists are you referring to? There are scientists (who might be knowledgeable but not willing to communicate their research), scientists communicators, science communicators, science journalists and journalists partly involved or not involved at all in science.
Research is very present in journalism as well, styles and methods may be different but sometimes they may be similar. And then, it depends on the freedom and type of media one is writing for. A healthcare journalist may be more knowledgeable, versatile, productive and important to society than a professor in just any field who does not bother to communicate in an understandable manner in and/or outside the classroom.
You can also see this discussion https://www.researchgate.net/post/Online_meeting-place_for_scientists_and_science_journalists