Yes. Byzantines are composed of Greeks, Russian, Serbians, Arabs, Romanians, etc. Orientals are composed of Egyptians, Assyrians, Armenians, Ethiopians, Indians, etc.
How does that really matter?
It's really not that important. I just thought the OP was looking for any kinds of differences.
Oh, and there are OO and EO of the same ethnicity, even in nations like Egypt, Israel, Syria, Armenia etc...
None the less, the predominant ethnicities for the two traditions are an entirely distinct list, like I just provided.
Liturgical Rites? How so? You all use the Liturgy of St. James which is still a valid liturgy, and which the EO still use occasionally.
The Orientals are not mono-ritual like the Byzantines. There are three basic distinct liturgical rites, the Alexandrian (including the Copts, Ethiopians, and Eritreans), the Antiochian (including the Assyrians and Indians), and the Armenian. All three are fundamentally very different in their structure. And within them even there are slight variations. For instance, the Ethiopians and Eritreans retain more than a dozen anaphoras, whereas the Copts have retained only three of them, though they once used all the same.
The Liturgy of James that you are thinking of is that of the Antiochian churches. But even at that it is not exactly the same as what you are thinking of. From what I can tell, the West Syrian rite attributed to James and the Byzantine rite attributed to James are slightly different, though coming from a common root.
Yeah, the basic ecclesiastical languages of the Orientals are Coptic, Ge'ez, Syriac, and Armenian. For the Byzantines they are Greek, Romanian, and Church Slavonic.
Again, why does this really matter?
It means that they have different saints which define the faith of their church, they have different texts that they are inclined to read, their liturgies are historically unintelligible to each other, etc.
And again, same as ethnicity, OO speak the same languages as many EO.
I'm talking about the languages predominant for ecclesiastical use, not vernacular.
Culture? Again, why does this matter? Yet again, same as ethnicity and language, there are OO and EO that share the same cultures...
Occasionally. But for the most part the two grew up in very different cultures.
Besides, who cares about differences like this... There are many EO that don't share the same ethnicity, language nor culture. Does this matter at all? Not at all...
It doesn't matter as a necessary point of division. But that doesn't mean that it matters not at all.