Sony REALLY started with the Z1. Until Z, it was rest of Sony Ericsson.
From S, we then had T, then Z, the Z1 and now Z2. Differences from the Z1 To Z2: Slightly better processor, another Gb of RAM, IPS screen, noise cancelation, stereo front facing speakers, slightly difference in design, bugger screen, newer Android version, to mention a few.
From Tablet Z to Tablet Z2 (I don't like Z2 Tablet, and I refuse to call it so): Thinner, lighter, yet same battery size and dimensions (height and width) Better build (Aluminium borders), Magnetic Port, way faster processor, another Gb of RAM, Triluminos + X Reality, to mention a few.
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Are you referring to the naming scheme or the tablet it self ?