The Seven Ahruf and the Ten Readings — Relationship and Difference

"The Quran was revealed in seven ahruf":
The seven ahruf: scholars disagreed on interpretation in over forty opinions. Most likely: seven modes of Quranic pronunciation/performance granted as ease for the community.

The Ten Mutawatir Readings: Narrations from ten imams authenticated by tawatur — belonging to the seven ahruf but not exhausting them.

Relationship: The seven ahruf are broader — much debate; the ten readings are narrower and more precise — defined by chains and narrations. The readings are not identical to the ahruf but are the mutawatir portion of them.

Ibn Al-Jazari: "All correct readings were revealed to the Prophet ﷺ and are established from him, being from the seven ahruf in which the Quran descended."