Replicate Blog related posts via API

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Hi HS community,  we are currently in the process of exposing our blog  to external web apps using the API (v3), and for the most part listing and loading entries is quite straight forward, but since we want to provide a similar experience as found in HS hosted blog site, we need to replicate the related_blog_posts Hubl tag used in the post detail pages through the API.

We thought simply doing a search request for all posts with a filter by all tags (tagId__in) present in the current article, which works but the results come quite different from what the hubl shows.. 

does anyone know the logic behind related_blog_posts to be able to replicate? 

Appreciate any pointers!