Peter,
First, for what statistic do you want a significance test?
Second, the Merge Files command, Data>Merge Files>Add Variables will allow you to add variables based on a common ID.
Third, and most important, can you provide the listserv with an example of what the two datasets look like before the merge, and what they would look like after the merge? It's difficult to help unless we have an idea of what your data look like.
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