The SWSP-core.php file has an include function in there
include("SWSP-config.php");
It's pulling the variables out of that file. If you change the filename to SWSP-configCell.php, then you would need to change SWSP-core.php to something else, and then a few more pages will need to be changed to reflect those changes.
There would be less file name changing if you created another "cell" folder and put the SWSP files in there leaving the original filenames intact. Your cell phone files will end up in that folder and won't get mixed in with the ones in the parent folder.