Spearfish and Avenger in parallel service

Would the Fairey Spearfish have served alongside the Grumman Avenger if it entered service during the war?

Yes; wartime demand kept multiple overlapping types in service, while American aircraft were especially easy to supply across the Pacific.

British carriers already operated overlapping generations such as Albacore, Barracuda, and Avenger because they needed every useful airframe. In the Pacific, American-built aircraft also benefited from a direct supply chain, whereas British spares traveled around Africa or across the Atlantic and through Panama. Parallel service would therefore reflect numbers, theaters, and logistics rather than a simple contest for one slot.