In a large zip-top bag, combine coriander, brown sugar, cumin, and 1 teaspoon each salt and pepper. Add pork and 1 tablespoon oil and toss to coat. Refrigerate at least 8 hours (or up to 1 day).
Heat a grill or grill pan to medium-high; clean and lightly oil hot grill. Grill pork, covered, about 5 minutes per side for medium. Let rest, covered, 10 minutes.
Clean and lightly oil hot grill. Toss zucchini with 2 tablespoons oil; season with salt and pepper. Grill until tender, 2 to 3 minutes per side. Grate 1 tablespoon lime zest, then cut limes into wedges. Transfer half the zucchini to a serving plate and sprinkle with zest and feta. Chop and refrigerate remaining zucchini for Herbed Ricotta Pasta with Corn and Zucchini. Serve zucchini and pork with lime wedges.
Pulling pork off the grill when it's still a little rosy inside is safe and makes for a juicy chop.