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changes
From what I have seen in my minimal research:
1. Elevator travels (see the TCDS)
2. Noticed that 337-0526 & on have additional doublers on the main landing gear bulkhead assembly (increasing strength in the lower part of the bulkhead)
There are likely a few other small ones, but spending some time with a Parts Manual will likely net you a great deal of results.
Of course, as the MTOW increases, the performance decreases given that the horsepower and airframe do not change.
Jeff
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