The phrase "same cluster" means things or individuals that are grouped together because they are similar or have some shared characteristics. Full definition
All of the essays repeat this same cluster of ideas, developing their im - plications with different emphases and nuances. (firstthings.com)
Cross-referencing Mantel's memoir with the novels, the reader encounters the same clusters of descriptors again and again, shared out among Mantel's mother, Jack, and Anne Boleyn, or among Cromwell, Mantel herself as a child, and Cromwell's small daughter, Anne. (firstthings.com)
But the two other sayings of the same cluster probably go back to Jesus himself and say much the same thing: One must even leave one's own family behind to participate in Jesus» cause (Q 14:26). (religion-online.org)