not one single part is enter changeable two totally diffrent saws,
I have 2 - 257, and one 357
i have had my 357 fo a year now,and only now am i starting to warm up to it, a great saw don't get me worng, one thing i really dislike about the saw is that the trigger does not slide back in to the handle all the way, it's a small thing but this is my main ground saw and after useing 257 for a good 8-9 years you get used to it .
And allso the 257 is alot more torque than its new brother, but i guess that can be fixed by getting it tuned,
that 257 is a indestuctable little saw and when i got mine the price was excellent, you could not bet that combo.l
awmart
play safe