In 72 you had WH23 car, WL21 cars, and WP29 cars. There was no stand-alone performance designated VIN like 1971 or earlier.
A WH23 car is a standard hardtop Charger with triangular roll-down quarter windows that could or could not also have the add on Rallye package A57.
A WH21 car is a standard non-hardtop Charger which also could or could not have the add on Rallye package A57. The rear quarter window looks very similar to a WH23 car but it is fixed in place.
A WP23 car was a non-hardtop Charger with a fiberglass window plug that made for a narrow, rectangular, vertical quarter window which is very distinctive from WH23 and WL21 cars.
Rallye gauges and a rear sway bar could be had on any of the cars without the Rallye A57 package under other option packages.