Just by way of further info, FWIW:
This has been an issue prior, but the reason it hasn't been an issue for these labels in InDesign already is because I just transitioned them (at long last) from Pagemaker to InDesign (CS1 --> CS6).
In Pagemaker, I just simply made a duplicate document, and shifted all content in that file. Now that I have the content in InDesign (and CS6 even), I'm hoping there'll be a way to do that quicker and more seamlessly.
And I have at least 2 other large label sets that I'm hoping I can also do this for - they'll require the same printer shift.