Broadly somewhat higher-end construction: the Rene Herse tires have a thinner casing fabric made from finer threads, a higher-tier tread rubber compund (I think), and a bead designed to be tubeless-ready. They're also a fairly low-volume product, and they're sold through a Seattle-based brand rather than coming direct from Panaracer. Panaracer manufactures a lot of non-Panaracer-branded tires, including Rene Herse. If you're comparing the Pasela to the Rat Trap Pass, the Rat Trap Pass is also bigger, which sometimes adds a little cost due to the sheer increase in materials.