How Many Seeds Are in a Pomegranate?

Hello and greetings, respected rabbis. I would like to ask you how it is that the sages of Israel said there are 613 seeds in a pomegranate, yet when we count them, we find more? Perhaps they had a different type of pomegranate than those found today? For example, see here: The Chasam Sofer, may his memory be blessed, in volume 2, for Shabbat HaGadol, 5611: "And according to my knowledge, it is known that a pomegranate contains 613 seeds, corresponding to the 613 commandments." The Malbim, may his memory be blessed, on Song of Songs 4:3 states: "It is similar to the pomegranate, which is full of 613 seeds." Hamelech Tzvi Yud Bet Elul, 5668: "This is according to what is known in books, that a pomegranate has 613 seeds corresponding to the number of 613 commandments." The Yetz Yosef on Song of Songs 4:3 wrote: "And in my youth, I heard that books state a pomegranate contains 613 seeds, as does the number of commandments. If it is a tradition, we accept it, and it is indeed accurate, and we shall not know otherwise." Thank you very much in advance. (It is important to note that I did not arrive at those sources through my studies but simply Googled it.)