ROW vs NA - differences
 

I recently purchased a 1990 944 S2 ROW car. It was imported from Japan. My question is, what are the differences between the NA and ROW cars?

The obvious:

- My Spedo and Odo are in KM's (which is great as I am in Canada)

- I've read that they adhere to stricter emmissions standards, but I am not sure what this actually means in terms differences. (O2 sensor, cat?

- Can anyone else tell me what is different, or point me somewhere?

Thanks,
Jordan