Who knows? Consistency suggests Earth-789 only, unless Earth-789 is Earth-89 through a megaverse with the comic multiverse, but then, why does the Flashpoint Universe exist separately from Earth-Donnerverse? I bet Batman '89 will crossover with Superman '78 at some point too, further complicating matters.
So, including fan made numbers for consistency, this is my interpretation:
Earth-78
Superman: The Movie: Extended Cut
Superman II
Superman III
Supergirl: Director's Cut
Superman IV: The Quest for Peace
The Flash
Earth-80
Superman: The Movie: Extended Cut
Superman II: The Richard Donner Cut
Earth-89
Batman
Batman Returns
Batman Forever
Batman & Robin
Catwoman
Earth-1/Earth-89 (Flashpoint)
The Flash
Earth-96
Superman Returns
Earth-789 (Comic Multiverse)
Superman: The Movie: Extended Cut
Superman II
Superman III
Supergirl: Director's Cut
Superman IV: The Quest for Peace
Batman
Batman Returns
Earth-97, as mentioned previously, is heavily disputed canon. The Arrowverse wiki even notes its Earth-97 page as non-canon, mentioning that Crisis Aftermath confirmed the Burton/Schumacher films were all set on Earth-89 by virtue of Marc Guggenheim and Kevin Smith's conversation. Earth-97 was an actor/release date joke that we take as canon due to the existence of the branching Burtonverse timelines. If anything, Earth-97 would only include Batman & Robin if it were canon based on the joke, with Batman Forever being Earth-95. Of course, that's absurd so people generally count Batman Forever as Earth-97. Even the writer of Batman '89 stating that Earth-97 was "too crowded" was because of a misinterpretation from a fan, vague, and arguably retconed by Dark Crisis and The Flash suggesting that Batman '89 isn't Earth-89/789 and that Earth-789 is a separate entity, thus the comic is unlinked from Earth-89 along with the Donnerverse.
Of course, there's so much personal interpretation that there's no objective truth. I'm sure you can make arguments for Batman '89 being Earth-89, thus Earth-97 is Schumacher and the Donnerverse is Earth-89. Just, personally, Dark Crisis and The Flash combined makes me come to the conclusion Schumacher is Earth-89 rather than Batman '89, reverting back to the Crisis Aftermath confirmations. Ironic, since The Flash ignores Schumacher in its alternate Flashpoint timeline.