I don't think that's true. GT3 make usually more power, but less downforce (according to drivers). And weight depends on the car. The Nürburgring is a good example, when the GT3 came in they had an advantage over the GT2 Porsches on the straights, but they struggled in the twisty bits.
Also, most GT3 series run with control tires, while GTE tire development is free.
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