I disagree, even the part numbers are the same.
I do agree that Mopar Performance made higher stall converters and there might be some late 70s pre-lockup years that might have high stall (like the little red express) but the factory musclecar years had only 3 basic converters installed. The 120k and the 145K with the 145 coming in two different input spline for 904 and 727. The only other part number was the Hemi a 145k with larger mounting holes.