Note: My system is set for English. Not sure how things will appear on non-English systems.
Suggest you use a test library with a few movies to see if you get the desired results.
If you are using the new Plex Movie agent you can add the IMDB ID or TheMovieDB ID to the folder and file name. Plex will use the ID to match the movie. See the support articles linked below for additional details.
Example: /Movies/movie_name (year) {imdb-xxxx}/movie_name (year) {imdb-xxxx} [all that other stuff].mkv
I added two movies to my test library. One with the IMDB id for Avatar. The other with the IMDB id for Batman Begins. Plex used the IMDB ids to match the movies and pull metadata: