I have heard but I cannot find any sources linking these concepts. The Shulchan Aruch HaRav mentions that the yod's on the letter tzadik are written upside down in ktav arizal; basically not facing each other. However, as answered here, the yod on the right side of the bent nun faces left towards the other yod in ktav beit yosef. Rabbi Dr. Ari Z. Zivotofsky touches up this in What’s the Truth about … Adam’s Spare Rib?, but doesn't make the connection with the kruvim. It seems obvious, but I can't find any sources linking the lot of these. What does it mean when they are facing vis-à-vis opposing?