Different model Brewster. that's the 339 we have the 239 the ones bought by the Finns, These models had numerous things removed before being shipped making them lighter and more towards their real potential as fighters.
I'm surprised the B239's biggest cheerleader has not chimed in yet. No worries though, he'll be along soon enough I'm sure.
There are issues with weight and engine power when comparing the different Brewsters, especially the wonderBrewster here in AH. I wish HTC would model a "real" Buffalo for the early war PTO scenarios. What we have is not representative.