Yeah the shapes are the same (or can be), but there are 2 modes that do not have 'CAGED' shapes - you need Lydian and Locrian to complete the puzzle. So, G:

I - G Major Chord / G Ionian Scale
II - A Minor Chord / A Dorian Scale
III - B Minor Chord / B Phrygian Scale
IV - C Major Chord / C Lydian Scale
V - D Major Chord / D Mixolydian Scale
VI - E Minor Chord / E Aeolian Scale
VII - F# Diminished Chord / F# Locrian Scale

E Aeolian is a mode of G Ionian, and vice versa. These are the 'Modes'. The notes are the same - an 'A Dorian' scale is just a 'G Ionian' scale played from the second note (A) and extended up to 'A' to finish...

Hope that helps...