This is a novice question.
What, if any, are the differences between American and Japanese baseball?
For example, if a pitcher posts an ERA of XYZ in Japan is it comparable to doing the same in the USA? (Different style parks? Different ways of handling the pitchers perhaps?). Or is OPS comparable?
I'm guessing the rules are the same (except maybe something minor) but are there cultural difference that show up on the field?
I guess the same question could be asked of baseball played in any country besides the US.