No, Japanese cars should have VINs as well. That's where the chassis codes like "EG" and "EK" come from. If the engine came from a Prelude there should be a "BB" in the VIN; if it came from an Accord, there should be a "CD" instead. Either way, I don't think there will be a difference in the power output. The only way there would be a difference is if the engine was hooked up to an automatic transmission. For some reason those H22s were rated at 180 horses...it's like they were detuned a bit for some reason...