Every week in the (Latin) Cathedral where I live we remember 3 or 4 parishes throughout the diocese. A couple weeks ago we prayed for a nearby Byzantine Catholic church. Although the church is located within the geographical territory of our diocese, they are of course not part of our diocese or under the jurisdiction of our bishop; they have their own Eparchy (Phoenix I believe).
Usually Latins don’t even know Eastern Catholics exist, so I am always pleased when they are acknowledged, and I am sure they are grateful for our prayers. But I did think it a bit curious that we are praying for churches in other dioceses (I certainly wouldn’t expect the BC Cathedral in Phoenix to pray for Latin parishes near me)–does anybody else know if this happens much in Catholic Cathedrals, East or West?