It will work fine, but I recommend you configure it to keep things separate between the 2 cars.
make 2 powerlogger folders, name one PL-TTA and one PL_GN (or whatever). then create shortcuts to the PLC program in each folder, then drag the shortcuts to the desktop. This way the separate setups can have their own PLC.ini file and you can make changes to one without affecting the other.
Bob