I will ask again: what is the main difference btwn the Byzantine and Russian practice?
The most obvious difference is : a greek(or byzantine )orologion is much more thick than a russian one. For the third part of orologion:"menaion,triodion and pentekostalion"(of course not the full menaion,but a brief enchiridion for those liturgical periods), the greek one have a "day-to-day"arrangement, in other word,a small note and troparion for every single day of the liturgical circle.
But in the russian one,only contains the feasts.The idea is:since you need the full menaion,triodion and pentekostalion anyway,why make the orologion so big?
The first part of the orologion is the standard parts of services of hours.Traditionally to say,only has the readers parts of matins and vespers,the priest's parts of "main hours"(matins ,vespers,vigil)you should find them from "leitourgikon". But the litany of priest in the end of midle-night hour and compline be included in the orologion.
If I do not make mistake,the Jordanville(Holy Trinity)version put the priest's parts (even D.Liturgy) in the orologion(it's not the traditional way,but very convenient).
Current russian and greek orologion follow the same typikon,there are no many difference(you still can find some slight ones from version to version,even in the same jurisdiction.) I do not know the old rite typikon,I heard that their vigil is much different from ours.
The second part of orologion: "the optional services" widely differs from region to region.
In the greek one ,generally has the akathistos of M.H.Theotokos;the small and great paraklesis of M.H.Theotokos;the parakletikos canon of "Sweet Iesus",of "Angelos Kyriou",and special hymns(akathist+canon)of Lifegiving Wood,of most glorious Trias....
In the russian one,some times same from the greek one,but in some versions,the second part be omitted (russians has special books for akathists and supplications).
In other jurisdictions, the second part can be extremely extended.For example,the romanian orologion of the period of H.B.Patriarch Ioustinianos,has almost 20 akathists!!! (But in the time of H.B.PatriarchTheoktistos,this superfluous amount was reduced).