Whatever template a document is attached to will always be the current one. So, updating a template means the document is attached to the updated one. That's quite a different issue from whether the document reflects the current template, however, and simply changing templates doesn't propagate anything to the documents created from it; the most that will be updated is Style definitions, and even that will only occur if the document has been saved with the 'automatically update document styles' attribute.

It's easy enough to use document properties or document variables to hold template versioning data but, other than the alert, to what end do you propose to put the comparison? And what about documents that don't have their template version recorded or weren't originally attached to your template but now are?

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]