As far as I know, the basic design of the Cruze, Cruze TD and Verano suspensions is identical. The cars share the same platform and along with that, the same suspension design (basic struts up front, twist beam trailing arm with separate coils and shocks rear).
The calibration of the suspension between models is what's different. They all have custom shock and spring rates based on weight differences and desired ride characteristics.
The 115mm bolt pattern comes with the heavier vehicle weight and larger front brakes (like the Verano). The way I understand it, the TD was not part of the original Cruze plan and to make it work they used the heavier duty parts from the Verano which has more powerful drive trains and weighs more.
The sound deadening techniques from the Verano were used, absolutely. But I don't think that has anything to do with the suspension design. If it does, it likely doesn't go beyond using softer bushings or something similar.