Typically direct injection is common rail. (Not always but more often than not.). So could be the same injectors just controlled differently for more HP. As others have said the 32 HP version would require emissions which would also necessitate that fuel system be ECU controlled to monitor DPF and perfrom regens.
Jeff.
Yeah, it actually says, high pressure common rail direct injection. The emissions and dpf are added systems. People remove regen systems all the time. Maybe the injectors are the same. I will continue to research. I know that I am the one asking the question, I will go ahead and say now, that regen and dpf would not give this tractor more power. I am just saying that you should be able to reprogram this tractor to have the same power since the engines are 100% identical. You could delete regen and dpf if you had the tools, but reprogramming a 3025e to squirt more fuel may be far easier.
p.s. I apologize, but I am coming from street bikes. We reprogram these bad boys all day for more power, and delete emissions. You just have to find someone with a dyno or ecu program. Probably nobody is doing this for tractors...