When British carriers might adopt American aircraft

Would Royal Navy carriers in a combined Pacific fleet use American aircraft?

Not immediately: British types remain likely in 1941, a transition could begin in 1942-43, and American aircraft become much more plausible by 1944.

A combined fleet does not imply immediate equipment standardization. Royal Navy carriers would retain British aircraft in 1941 because those were the types already supported by their squadrons, stores, and training. A transition toward American aircraft becomes possible during 1942 or 1943, depending on British production and service preferences. By 1944, common American types are much more plausible, showing that coalition integration develops through logistics and time rather than a single command decision.