Difference between Toro Z400 and Z450?

I've been searching for product brochures on the Toro z400 and Toro z450 so I can compare the two models. I can't find much about them. Does anyone know what the difference is between these two models. From my own knowledge I know that the z400 has two less horse in the kawi version and that it doesn't have the adjustable deck.

Is there anything else different?