I question the integrity of the data, as I'm guessing they're largely manufacturers' claims. F'rinstance, the numbers on my car are the same as those in the literature in my owner's manual, which states the 400 lb. heavier, less torquey 500SL beats a 500E to 60.
I think that each and every car's different within a breed, and I'm sure hp at the rear wheel varies greatly. I've owned slugs, and I've owned overachievers. And I'm sure you'll agree, overachievers are more fun (when they also underachieve maintenance-wise!)
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All the best, Michael
500E
300TE