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What’s the best way to merge photo libraries in Aperture?

Before upgrading to Catalina, I’d like to merge a couple of photo libraries from Aperture. Can you tell me what’s the best way to do this?

Apple’s Aperture isn’t fully 64–bit compatible and won’t run in Catalina. Before upgrading to the new macOS, you’ll need to convert its libraries to Photos or another more modern app. If you also need to merge them, you can either do that first within Aperture in Mojave then migrate the merged library, or migrate the individual libraries first then merge them. Before you attempt either, ensure you have full backups of both libraries.

You should try this first following the instructions in Aperture’s Help book to merge the libraries and make any tweaks and corrections to them. This is likely to deliver the best results, and you can then migrate the merged library using Photos. Merging individual libraries in Photos involves exporting the entire contents of the smaller library — once