71 has the split grill, the Demon fender emblems were all stickers and they had a rally dash like the 70 Dart Swinger.
72 has the one piece grill, the Demon fender emblems were chrome with yellow and red paint. The rally gauges were gone leaving a rectangle shaped speedometer surrounded with small gauges for oil, temp etc...
71 has the more desirable horse power and forged crank as well.