Low speed torque and driveability ?

Newbomb Turk said

No one is asking you to be perfect. Just asking you to realize that posting any number for converting wheel power to crank power is at best a guess.

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What I don't get is, doesn't take X amount of hp to turn a trans, rear end, tire etc.. Shouldn't take a similar amount of power loss at similar rpm (not a percentage), be it a 300 hp engine vs 600 hp engine ?