Are there any tuning differences between the C# Major Scale and Db Major Scale?

Question

Are there any tuning differences between the C# Major Scale and Db Major Scale?

Answer 1

No. A Db major scale is an enharmonic respelling of the C# major scale. Db major is spelled as Db Eb F Gb Ab Bb C and C# major is spelled as C# D# E# F# G# A# B#. Since C#= Db, D# = Eb, E#=F, and so on, the scales sound exactly the same. They are written differently to facilitate easier readings through key changes/modulations and ease of reading for different instruments.