I think you'll find that, in practice, there are many pages that fit "between" other pages in other languages. As random example, say English Wikipedia has "Mat

I think you'll find that, in practice, there are many pages that fit "between" other pages in other languages. As random example, say English Wikipedia has "Matrix multiplication", "Strassen Algorithm" and "Coppersmith-Winegrad Algorithm" pages, whereas the German Wikipedia might have a "Matrix Multiplication Algorithms" page (this is not the current reality, but it could be). This makes sense, because if one wiki has, say, 60% of the content (and depth) of some other wiki, it will break it down into pages differently. Being able to speak both languages, I often find it instructive to browse the pages on a subject on both English and German Wikipedia, as the structure and depth of the material will often vary either way. It's sometimes unfortunate, but other times also possibly warranted that these wikis cover subjects to a different degree.