Comparisons between The Flash TV show and The Flash movie are going to be inevitable, which is both good and bad for the upcoming DC Universe film. After years in development, the first live-action Flash movie arrives in 2023 at what could be the end of the previous DCEU and the beginning of the new DC Universe. James Gunn confirmed that The Flash “resets” things, which adds to the importance of The Flash movie for the future of the DC Universe.
https://screenrant.com/arrowverse-the-flash-movie-show-better/