Should have been more specific. 2008 Challenger weighed over 4100 lbs; 2008 Charger around 3700 lbs. Challenger width was an inch wider than the charger. The Challenger is about 3-inches shorter and a shorter wheelbase.
Actually, the 2008 Charger and Challenger are almost identical in weight across the range of engines and options with the Challenger weighing just slightly less.