The phrase "different yarns" means various stories or accounts, often in a figurative sense. It suggests that there are disparate versions or perspectives on a particular topic or event. Full definition
Use different yarn weights to create hearts of varying size. (thespruce.com)
This unique infinity scarf is created using three different yarn colors together, forming a lovely alternating pattern reminiscent of the beautiful cherry blossoms that bloom in the spring. (12thblog.com)
I made 12 different yarn balls in 2 different sizes. (thehyperhouse.com)