Japanese F4U-1A BR inconsistency?

I recently started playing this plane and noticed that although it’s an exact copy of the 2.7 American F4U-1A (minus the bombload), it sits at 0.3 BR higher. I was wondering if there was a reason for it, since it doesn’t physically perform any better and also loses the option to carry bombs like the American tech tree one. It doesn’t make sense to me, and I’d appreciate any input.

Way more experienced JP pilots & teams score way more kills … JP Corsair was always a clubber plane.