Merge Multiple Sites/Networks (at least 2) into One Site/Network

What methods exist to merge at least two WordPress sites together that already live under one Multi Site instance? E.g. Sites wp_2 and wp_3 become either wp_4 or are merged together under wp_2.

I suspect that this is no different than migrating or converting an existing WordPress site/data into a Network that has been outline here and includes all the caveats of 301 mappings, updating site options, and existing URLS found inside options and content.

Topic merging multisite Wordpress

Category Web

1
answered at

Easiest way would be to just export the one WordPress site, and then import it into the new site. Don't try to get too complicated with this.

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