Pretty much the same engine except the fact that you can cliam JDM on one and not the other.....only real difference is the external coil on the USDM model.

Not real sure about the other differences though.
I run a USDM engine and its been more than fine for me.

Looking at the year of your car your gonna be real limited in choices...according to legality the engine has to be the same year or newer than date of manufacture of the vehicle. Now most times this really doesn't matter much but if you have vehicle inspections in your state and they run the numbers on the block it may come back as a fail...check your local laws about this.

Aside from that the only other thing to remember that your car has to retain emissions package for year of manufacture as well as the emission standard. If it is OBDII it must remain OBDII unless you upgrade to OBDIII and once it goes up it can't go back (don't understand that one its just what I have been told over and over again).