Would 6,300 improved Zeros change the Pacific War?

Would Japan's plan for 6,300 improved A6M8 Zero fighters have materially changed the war?

Yes, if Japan could actually build, fuel, crew, and operate them; the paper total alone could not create combat power.

Authorized or projected aircraft numbers are different from usable force strength. Thousands of additional fighters could matter, but only if the industrial system produced them and the navy supplied fuel and trained aviators to fly them. A plan for 6,300 aircraft has military value only when production, logistics, and personnel arrive together. Without those supporting conditions, the paper total does not become combat power.