@jdammers thanks for your quick input! Here is a section that exemplifies how comparisons between Python and C are performed. Both solutions are read and each of their fields is passed to the comparisons.
You would suggest to base comparisons not only absolute values but also on normalized differences between absolute values, e.g., percentages, to take into account the unit / scale? Also you would suggest computing means and standard deviations. I think this was already,  at least in part addressed by comparing histograms between C and Python (which is looking good). What do you think?

Btw. @Eric89GXL I see an isolated print statement above, probably a debugging remainder.