There are several differences between Grant Gustin’s Barry Allen from The Flash show and Ezra Miller’s Barry Allen from the DCEU. Between the world around them and the events they went through, DC’s most recent live-action Barry Allens are very different from each other. Gustin and Miller were cast as Barry Allen around the same time, although all nine seasons of The Flash show were released before The Flash movie premiered. Arrow and its spinoffs were separated from the DC movies since the beginning, which is why the DCEU had a different Flash from the TV show.
