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It doesn't work the same way for OEM versions
See, that's what I thought as well, but according to several posters in this thread, it does indeed work... however, I think technically, according to the EULA anyhow, it's not legal....
If it's a retail version, yes you can use the same key. It doesn't work the same way for OEM versions.
You can either borrow a 64-bit retail disc from someone (doesn't matter what version, all the discs have every version of Vista on them), or click the link below:
Ordering retail 64-bit or 32-bit media:
http://www.microsoft.com/windowsvista/1033/ordermedia/default.mspx