Markos knows his stuff!!!
In general Eastern/Byzantine Catholics venerate many saints liturgically that are not venerated by the West. This is in part because saints are traditionally a local phenomenon; i.e. we honor those who come from our own region, province, country, tradition, etc. You will not, therefore, typically find Sts. Francis of Assisi, Thomas Aquinas, Bonaventure, Rose of Lima, etc., etc., etc., on an Eastern liturgical calendar; just like you will not typically find Sts. Constantine or Gregory Palamas on a Roman liturgical calendar. It’s not because one Church doesn’t think the other Church’s saints are saints. Each recognizes the sanctity of the other’s saints, they just do not venerate them liturgically because they are not part of their particular tradition. Of course, the laity are free to venerate these saints privately.