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I don't think there is any difference between the NGK plugs. Just check to make sure that the numbers are pretty much the same. They may have a different letter or 2, but the numbers should be the same.
And, as a side note - you can run the NGK copper plugs in the SR20 engine. I've had mine in almost a year, and they are doing fine. The platinum plugs will last a lot longer, but since I can by almost 5 sets of the copper to 1 set of platinum, I wouldn't even mind changing plugs every 10k miles. The coppers are supposed to be good for 25k, the platinum for about 50k.
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