Setting up an Object Style would have been helpful, and I use a plugin that creates an InDesign file from a multipage PDF. Even though the InDesign file created from the multiple page PDF would have been the wrong size and crop, could I then use something like the Zaneli MultiPageImporter:

https://creativepro.com/zanelli-releases-multipageimporter-for-importing-both-pdf-and-indd-files.php

to import that .indd into a new final size .indd document that corrects the sizing and position? Is there a version of the script for CC 2015, or something else that provides the same functionality?

Thanks Kelly and Colleen for the ideas.