I would say "какой день будет завтра" is more formal way of expressing the same phrase, but both are correct. I wouldn't use "Какой день завтра" in official docs/letters etc
October 24, 2019
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Оба варианта верны
October 10, 2019
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Верны оба варианта
October 9, 2019
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Оба варианта верны.
October 9, 2019
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It depends to kontext. But both version can be used.
October 9, 2019
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Mehrdad
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English, French, German, Italian, Japanese, Latin, Persian (Farsi), Russian, Spanish