Academic writers present information primarily for other academics, and to that extent they are not particularly interested in style
Most academic writing has to be peer judged, and fit into a particular format for publishing
Most academic writing is either voluntary or poorly paid
Most academic writing is dreadfully written
Technical journalists translate academic writing for the layman, so are concerned about style. Their market dictates what their style is
Most Technical journalists are paid salaries, so the size of their market is not a concern to them
Creative writers are totally concerned with their markets as they are paid on sales
Creative writers use agents, and are concerned with getting reviews and distribution
Creative writers are not peer judged, and the only constraints on their work is the House style of the publisher
They are concerned with different platforms such as print, self-publishing, eBooks, Blogs, illustrations, copyrights, translations, serializing, and any merchandising rights
In regards to the question
The similarities in creative and academic writing are primarily in the legal aspects of protecting the copyright of the published works