There should be a date on the head as well that will help you. Plus IIRC the CTR/ITR heads have the same head casting number and are both port and polished from the factory.
5 second google search: "00 JDM ITR head is PR3-3 '97 USDM ITR head is PR3-2. The casting number has NO relevence to MAKE MODEL OR YEAR, it simply is a casting production stamp...anyways, b16/b17/ITR heads are all from the same cast. The casting number being exsample
r3-X there is no way to determine what year,make or type knowing that."