Rikki, I have seen DGX in music stores, and too a Clavinova.
DGX keys seem very different to Clavinova ones (built better, key feel...), and they seemed smaller to me. So, I measured them, and the result was clear: one octave is 1/5 inch less in DGX than Clavinova. So, the lenght of all keys DGX has is more than 1 inch less in DGX.
As a piano player..., is it this difference something important to play? May you play both keyboards you have without problems, or any difficulty to pass from one to other?