K100 and KPro will give exactly the same figures, they are the same ECU. It is just a daughterboard that effectively hacks the OEM ECU allowing OEM parameters to be changed.
The difference is, K100 can only be tuned by aithorised Hondata tuners, KPro can be tuned by anyone who is brave enough. Also, you can datalog on KPro.
If you inted on getting someone like Mase to map the car, then you would need to get KPro, but if you stick to TDI North or other Hondata authorised tuners, K100 is ample. Unless of course, you have a desire to run datalogs yourself.