If you check the frame length on the ZT1 42 and 50 is 82", the ZT1 46 is supposedly 84".
All 3 mowers have a fabricated deck available, the 42 and 46 are 2 blade and both mowers use the same Kohler engine with the same HP rating.
The ZT1 50 has a Kawasaki motor rated a whopping 1 hp more, no...