The 419 uses the same gearbox as the 417 but the cab from a 416. I believe that some of the cabs also used the 417 style mounting so we're quite comfortable. They were also tuned to 130hp from the factory.
Much of the back body is taken up by tool boxes and hydraulic connections for the tools that they could be specced with from what I know, however don't quote me on that. I do know that there's an auxiliary hydraulic tank mounted on the back.