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Of course there were changes to the PCM program that modified the power/torque curve; but most of these mods were due to the increase in HP and torque from the use of a larger bore engine.
I agree with Mike E, there is not that much difference, but I will say I have not tried driving up any large mountain roads in one. My experience is from rush hour traffic and one or two merges onto an interstate in non-rush hour traffic.