I agree that swapping out enough details will eventually avoid copyright infringement, but its possible to swap out low-level specifics and still be so obviously a structural and topical "copy" that someone can get into trouble.

For instance, movies that were too similar to predecessors have been found to be infringing.

Example: Universal/Jaws vs. Great White.

https://screenrant.com/jaws-movie-universal-canceled-italian...