I don't work with the Calibre editor, but I do use Sigil. You can do the same there. Just load the HTML and the images will also load.
I would do the replace differently to be honest. Just open op the ePUB in for example 7-zip and just replace the images there by the other versions. Then fire up your editor by choice and check.
Myself I do neither. I do use the images from the HTML export, but from ABBYY I save in Word format. Then I cleanup the document to fix all the OCR errors and alike. Why in Word? Because my tools work as an addin in Word and that fixes a lot of errors for me.
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