The only difference is in the manifolds used and the block configuration. The internals were all the same!

Maybe the model AVS Carb was different as 2 models are listed for each Stick and Auto

A-Bodies were "S" block builds. (Machined off Left side rear engine mount ear and drilled bosses at the oil pump for left side mount, chrome covers and oil breather.) Hemi Orange

RR and SB were "H" block builds (Normal Engine Mount ears no drilled boss at the oil pump.) Hemi Orange

It was nothing but marketing! They both have HP stamps on boss under the Dizzy.

Were they going to tell the buyers the Barracuda or Dart had the same power in an economy car as the highly marketed Road Runner or Super Bee mid size cars? Heck no, you spin it. The loss in advertised HP on the A-body left manifold was easily gained in weight loss of the car. A-body 383 cars rule!

See Attached.