Or can I go through and override the defaults like shown in the the article you linked.
What you can do is check the images, and make sure they’re set to “Use Document Default” (like it shows in the screenshot in that article).
You’d need to follow these instructions if the images are already in your file:
If you have already imported an image, you can find the same options by selecting the image on the page and choosing Object > Image Color Settings.
If they are set to “Use Document Default”, then you shouldn’t have to worry about changing them. Then you’d just want to make sure that when you export that you select the “preserve numbers” option.