Could the difference be "LED Clearance Lights"? They are on both levels of Touring. Visual Tables of Gen4 Package Combinations | PriusChat
The LED "chevron" parking light is on Three and higher. Also, on Three Touring and Four Touring, the forward-facing parking light is the LED clearance lights so those models do not use the amber turn signals as parking lights, giving them an all-white appearance when viewed head-on. The LED Clearance Lights are the 3 vertical LEDs that are below the LED foglight.