Put the pork and zucchini in a large bowl. Add 2 Tbsp. olive oil, the lemon zest, cumin, coriander, 1 tsp. salt and the cayenne and toss; let sit for 10 minutes.
Meanwhile, add the orzo to the boiling water and cook according to label directions. Drain and rinse under cold water. Transfer to a bowl; add the tomatoes, parsley, lemon juice, the remaining 1 Tbsp. oil and 1/4 tsp. salt; toss.
Preheat a grill or grill pan to medium-high. Grill the pork and zucchini, flipping once, until the pork is cooked through and the zucchini is tender, about 12-14 minutes. Slice the pork on an angle and serve with the zucchini, orzo, and lemon wedges.
