Not sure if I understood the first statement, or the correction smile

Each major key has seven modes. Each mode is a scale started from a different note. There are no duplicate scales within the modes, there are duplicate chords however.


C Ionian has a major chord, same as F Lydian, but the Lydian sports a raised fourth note (in comparison).

D Dorian sports a minor chord

A Aeolian sports a minor chord and has a identical scale structure to the Dorian, except it has an additional flat 6th.

E Phrygian is the same scale structure as A Aeolian except it also sports a flat 9th (2nd). It also sports a minor chord.

No two modes have the same scale


If that is dizzying it helps to look at the piano whilst working things through

Hope that helps

Zero


Win 11 64, Asus Rog Strix z390 mobo, 64 gig RAM, 8700k