The Medieval Latin doctrine of transubstation and the real presence are not one and the same.
If you want to see a good discussion on this, here is a thread for you.
https://texags.com/forums/15/topics/2827612/1#discussionQuoting from that thread
Since the "T" word was used, here is a list of terms used by church fathers and writers throughout the history of the Church to describe the change that takes place during the Mystery:
an anointing (chrisis Theodore of Mopsuestia, Catechetical Homily 16.12, ST 145, 553);
a becoming (genesis Serapion of Thmuis, "Prayer of the Offering," The Sacramentary of Serapion [Thessaloniki: 1967], 125);
a blessing (eulogia Divine Liturgy of Saint Basil the Great: "And bless [these Gifts] and sanctify them and show them to be);
a bringing into sight (hyp' opsin agoge Dionysios the Areopagite, De Ecclesiastica Hierarchia 3.3.2-13, PG 3, 444A-444C);
a completion (teleiosis Germanos of Constantinople, Historia Ecclesiastica, et Mystica Contemplatio PG 98, 437A);
a consecration (hierourga Gregory of Nyssa, In Baptismum Christi, PG 46, 581C);
a conversion (conversio Ambrose of Milan, De Sacramentis 4.5.23, SC 25, 114);
a divinization (theourgia Theodore the Studite, Epistolarum 2.203, PG 99, 1617C);
a descending upon/dwelling in (epidemia Serapion of Thmuis, "Prayer of the Offering," The Sacramentary of Serapion, 125);
an immixture (emmixis Eutychios of Constantinople, Sermo de Paschate et de Eucharistia 2, PG 86-2, 2393C);
a making (poiesis Cyril of Jerusalem, Mystagogiae 5.7, SC 126, 154);
a making-divine (theopoiesis Symeon the New Theologion, Ethical Discourses 3, SC 122, 428);
a manifestation (apophansis Irenaius of Lyons, Fragmenta 38, PG 7, 1253B);
a mutation (mutatio Ambrose of Milan, De Mysteriis 9.52 SC 25bis, 186);
a sanctification (hagiasmos Mark of Ephesus, De Corpore et Sanguine Christi, PG 160, 1080A);
a sending upon (katapempsis Divine Liturgy of Saint John Chrysostom);
a showing forth (anadeixis Basil the Great, De Spiritu Sancto 27.66, SC 17bis, 480);
a transelementation (metastoicheiosis Gregory of Nyssa, Oratio Catechetica 37, PG 45, 97B);
a transformation (metaskeue John of Damascus, Vita Barlaam et Joasaph, PG 96, 1032A);
a transmutation (metabole Divine Liturgy of Saint John Chrysostom; Theodoret of Cyr, Eranistes 1, PG 83, 56B);
a transorientation (metarrythmisis John Chrysostom, De Proditione Iudae 1.6, PG 49, 380);
a transubstantiation (metousiosis Gennadios Scholarios, De Sacramentali Corpore Christi 1, PG 160, 360C);
a transversion (metapoiesis Cyril of Alexandria, In Mattheum 26.27, PG 72, 452C);
a uniting (syzeuxis Samonas of Gaza, De Sacramento Altaris, PG 120, 829B);
a visitation (epiphoitesis John Chrysostom, On John 45.2, PG 59, 253).
