Aren't C-sharp and D-flat the same note?

The Difference between C# and Db - P.M.Adamson

Keyboard Major Chord C-sharp = D-flat, Key of D flat = C sharp, Db = C#

Is Cb the same note as B?

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Common Chord Progression: 5-1-4 in the Key of C Major

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C#とDbは同じ音ではありません

C Major Chord on Piano