Which parts are interchangable for a 74' plymouth scamp?

Here's a basic run down of body parts swapability...Duster front clip is the same as Valiant or Scamp of the same year so all front clip parts are an easy swap. Front clips of Darts and Demons of the same year share the same parts. Dusters, Demons and Dart Sports are the same from the doors back, except the tail light panel, again of the same year, or years in some cases. Now to your question of swapping front bumper between Dart and Scamp the answer is possibly if they are the same year, but then they will have the same big ugly rubber bumperettes. However, it is possible they will not swap because the front fenders are different between Scamp (Plymouth) and the Dart (Dodge). You could swap on the entire front clip and call it a "Scart" or maybe a "Daramp". The easy way out is to just unbolt the ugly bumperettes and toss them in the corner of the garage.