Unfortunately this is the exact thing that the developers are worried about: that you think that you can compare in this way.
The breakdowns are on "different scales", which means you can't compare them to each other.
You can only compare your 9x9 blitz rank with your opponent's 9x9 blitz rank. You can't (meaningfully, as the mathemeticians would understand it) compare your 9x9 blitz rank with your 9x9 correspondence rank.
Ironically, though, this limitation is true whether they are displayed in glicko or k/d.