They aren't, but Anker seems to be the OEM for some Aukey and Ravpower products.

And yes, I mean Anker as the OEM, not sharing Anker's OEMs (because they build stuff like how Apple uses Foxconn (and like literally every single electronics manufacturer does)).

Aukey and Ravpower always seem to be a generation behind, but keep up with Anker quality. So either I'm correct, or what is actually happening is still very similar.