I don't know why you say that one is citron and the other lemon? Did you get them from a different place? Look, from what I have in practice, Cidro is monoembryonic and that is a diagnostic character, that is, if it is polyembryonic it is lemon or a hybrid. The figures are generally more shelly, have very thick skin and there are large sizes. They do not have a typical lemon smell but rather something different. and its leaves are generally oval-shaped since the base and color are rounded. The lemon is polyembryonic, juicy, its leaves end in a point. and the seedlings up to 30 cm differ. in which the citrons have. leaves "without joint" or short petiole, lemon plants have long and articulated petiole. In short, with the entire growth process we will see if we can resolve your doubts. Go upload photos and we'll see. For now I'm opting for lemon 🍋