The geometry of the Medium ZW is identical to the 51cm Z, and the Tall ZW is identical to the 54cm Z. That leaves just the 650c wheeled Petite ZW and 700c wheeled Small ZW as unique from the Z line.
I didn't check, but presumably they do change the componentry they hang on the frames. I lost interest in researching** further when I noticed that 1 ) the ZW line ends before growing to my size, 2 ) the larger ZW geometries aren't unique, and 3 ) their regular geometries totally wouldn't work for me.
** I've recently been downloading road/cyclocross geometry charts from many manufacturers...




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