Same name, different price! Differences???

Hello, I’m just looking around at summer tyres and still swinging between the Pirelli Cinturato P7 and the Bridgestone Turanza ER 300. Both good tyres, but now to my problem: One finds from one and the same supplier the tyres with exact same designation but strongly different price. e.g. offer from my Opel dealer the Pirelli Cinturato P7 in 205/55R16 91V once for 112,- and once for 79,- Euro… There are also no abbreviations for emergency running properties, or rim protection What’s the difference? Which one is the winner of the test? Are both equally good? My dealer couldn’t tell me either.