Not even close. Grants campaign at Vicksburg is a text book example of original thinking. He outsmarted Lee crossing the James. Hood by the time he was given command of the AOT had already lost a leg, had an arm shattered and probably was probably on drugs for the pain. From a tactical point of view, Cold Harbor was a failure, Grand said so in his memoirs, Lee never admitted a mistake for the thousands of Confederate soldiers lives he threw away attacking up Malvern Hill or Cemetery Ridge. Both assaults up hill, against an enemy waiting for the attack and backed up by massive artillery support. As a matter of fact, at Malvern hill, Union infantry watched their artillery slaughter Lee’s troops and most didn’t even have to fire their rifle muskets during the battle.
If you think Cold Harbor was a one off then you mis understand the whole campaign of 1864. The campaign from the blue side was frontal attack which was repulsed then to the left march all the way to Petersburg. Cold Harbor was just the worst of them so it gets the most publicity. John Hood would have done the exact same thing as Grant.