You should try this on some duplicate book in Calibre whose cover you won't mind changing first.
This is the way I've learned to change a cover in Calibre, others may have another way:
Select- Convert Books
Select- Look & Feel
Select- Embed all fonts in document
For me, the new cover is added and nothing in the books changes.
I tend to tinker with settings all the time so I may have made changes to Calibre I don't remember. But this is what I do.
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