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I have had a set from AutohausAZ sitting in my garage for a while....if they are the same, I don't see why you can't use them. Just compare when you take your others out to see that they are in fact the same.
I can't recall if I have ever had mine changed out...I want to say no, but I just can't remember. I am at 40k miles (after 5+ years of ownership).
Just plan on changing, can't hurt, and worse case scenario you get in there, the existing plugs still look good, and you leave them in and keep the others till you need it. If you are at 56k though on an N54/N55, you will probably need them.
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