CPS21 evo was the internal project name for the development of the VPP21. So, the bat files containing evo refer to the VPP21, the other ones to the CPS21 hardware. When using the VPB40 with HMI classic, the VPP21 (evo) files are used as well.
Another important difference apart from the hardware is the version of HMI classic. Std\Vis\Cps21.exe V2.x requires Evo batches, V1.x the old ones.
At least that's what I remember almost 20 years later... 😉
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