Copying an Indesign book document

First off, Happy New Year to everyone around the world, or maybe across the world.

Here's my question:

I have an InDesign book, made of 30 separate documents (chapters).
It has 31 images in it. For print I have had to make the images in
B&W because the print cost for color leaves no profit margin for sales.
I can however export it as an EPUB (electronic) with color because
the cost for this is very low and there is a decent profit margin.

My question is this: can I "copy and save" the B&W version, create
a new folder for this document, then change the images to color
images, save that and export it as an EPUB?

Or will this somehow "confuse" InDesign as to which version it was
familiar with, location, name, etc. and then freeze or stall, without
my being able to close it out or cancel an action as it as done in
the past?

Or should I change the images to color in the B&W version, then "save as"
the new color version, but not save the edited B&W so that it will revert
to the B&W pre-edited version when I close it out?

Thanks in advance