Sorry for the slow reply Ash,
There's a list of the exact differences 103 to 125kw somewhere in the diesel section, I couldn't find it just now, but from memory:
Extra water cooling channels around the injectors - different head
Forged and lightened crank
VNT 17 turbo with a higher accuracy VNT controller
different head gasket
Much larger EGR system / cooler
Different swirl flap inlet design, extra breathing ability
Different valves, pistons
Extra oil vapour seperation systems
a few other things, but in all VW have upgraded everything to handle the extra load, heat, and power delivery of the motor.
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