There are mechanical differences between these models, but also drivetrain differences. Different clutch, gearbox, diff ratio's & gear sets. So no, it's not just software!
We have modified dozens of these (both engine forms), there is a lot to consider before you purchase on what you will require total power wise (or more likely torque).
I have a 128kw & for the extra bucks I would go with the bigger output any day. I have towed 3 ton (braked) car trailer & car behind it up through the mountains & it was effortless. My friend following us in a V8 twin turbo TDI cruiser couldn't believe it!
You can see from graphs your expected modified outputs, 0-100 times etc.
hopefully this will help out
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