There is no standard Martin that has the same specs as the Johnny Cash. People can argue that you are "just paying for the name" with Martin signature guitars but they always have unique specs versus the standard models, be it bracing, neck profile, nut width, or tone woods.
The closest probably would be the HD-35, but no Engelmann top. And the 35's are the only Martin dreads with 3 piece back and 1/4" braces. Outside of a custom the HD-35 is the closest. Martin occasionally uses Engelmann but not in standard guitars, my OM-45TB has Engelmann and the HD-28KM has an Engelmann top, there may be others but it's rare.
Whether it's the 1/4" braces, the 3 piece back, or both the 35's are the fat bottom girls of Martins dread line, they have low end to spare. I think a used HD-35 would make you very happy. Good luck!
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