It's not the weight of the prop. it's the weight of the airframe between the Hellcat and the Bearcat.
An F6F weighs about 9200lbs empty, AN F8F-2 weighs about 7650lbs empty. The F6F has a 334 sq ft wing, one of the largest (in not
the largest on any single engine fighter in large scale use) compared to the F8Fs 244sq ft.
The Fuselage is sort of in proportion being almost 6 feet longer on the F6F.
Bigger fuel tank/s and so on.
Loaded it just gets worse.
You can put drag slicks on a 1968 427 Impala
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Doesn't mean you are going to come close to a 68 427 Corvette.