Not sure about the 964+. But for the Carrera it is easy.
The weight difference is pretty easy to account for - bumpers, power windows, larger wheels and tires, ac, etc.
In fact most of the early car updates end up putting some of that weight back in - wheels and tires, brake upgrades, later transmission...
It is easier and cheaper to pull those items out of the later car than it is to drop the new engine in the old car. And the results would weigh about the same. And be galvanized.
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