I use the SAME Calibre Library with 2x models of Kobo, many Kindles (some are same model), a Nook and a Sony. All on ONE laptop.
I don't see a problem.
I used Calibre with SAME Library to swap two Kindle PW3 entire content too (aided by DRM plug in) between me and wife, so she could have the brand new one (well it was then).
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