1974 Torsion bar into a 1975 Duster?

Would there be a big difference (or dangerous difference) putting just the "newer" 1974 Torsion bar from a Dodge Dart onto my 1975 Plymouth Duster? (I could get the right side if REALLY needed, but just don't have the extra cash yet.) It's for the driver's side, which broke completely in half (just my luck, right?)