The variable name convention in the Python pvlib documentation is here:

https://pvlib-python.readthedocs.io/en/stable/variables_style_rules.html

SAM's weather file reader column names are defined here:

https://github.com/NREL/ssc/blob/632217258303cdbb77f471b517187b701f56d08e/shared/lib_weatherfile.cpp#L948

Modify lib_weatherfile.cpp to accept pvlib variable names.