I've cooked this recipe with both loin and shoulder chops.
If the lamb chops are thinner or thicker, it is fine, but adjust the roasting time accordingly; for best results, use a digital meat thermometer.
Rare: 48 degrees Celsius/ 120 degrees Fahrenheit.
Medium-rare: 52 degrees Celsius/ 125 degrees Fahrenheit.
Medium: 55 degrees Celsius/ 130 degrees Fahrenheit.
Well-done: 62 degrees Celsius/ 145 degrees Fahrenheit.