If you have a Challenger, you can only use seats from a Challenger. While the seat tracks are essentially the same between the Challenger and the Charger, Charger seats do not have the ability to fold-forward to allow passengers to enter the rear seat.
Challenger seats have two variants, 2008-2010 (no airbags) and 2011-2016+ (airbags).
If you have a newer Challenger with airbags, you must use the airbag equipped seats.
If you have an older Challenger without airbags, you can use either but the connector is different so you'll need to do some wiring. You'll also need to use your secondary bracket for the passengers side (The two L-Shaped metal brackets that are bolted to the track). Click for infographic.