Planes such as these ones would be used as weapon launching platforms anyway. Detecting and targeting would be made from different planes with better radars. Plus, who's to say only these trainers would be used? Taiwanese could mix it up, put squadrons of f16s and f5s with squadrons of at3s. For chinese radars, they could all be the same at a certain distance. You should then always assume the worst possiblity, that they're all f16s, for example.