But the priest is, therefore he can only give Communion as per his own canons, not the communicants.
And his canons say “Any baptized person not prohibited by law can and must be admitted to holy communion.” Can. 912 and “Sacred ministers cannot deny the sacraments to those who seek them at appropriate times, are properly disposed, and are not prohibited by law from receiving them.” Can. 843 §1.
What makes an Eastern Catholic properly disposed to receive?
CCEO, Can. 697 Sacramental initiation in the mystery of salvation is perfected in the reception of the Divine Eucharist, and thus the Divine Eucharist is administered after baptism and chrismation with holy myron as soon as possible according to the norms of the particular law…
CCEO, Can. 712 Those who are publicly unworthy are forbidden from receiving the Divine Eucharist.
CCEO, Can. 713 §2 Concerning the preparation for participation in the Divine Eucharist through fast, prayers and other works, the Christian faithful are to observe faithfully the norms of the Church sui iuris in which they are enrolled, not only within the territorial boundaries of the same Church, but, inasmuch as it is possible, everywhere.
CCEO, Can. 719 Anyone who is aware of serious sin is to receive the sacrament of penance as soon as possible; it is strongly recommended to all the Christian faithful that they receive this sacrament frequently especially during the times of fasts and penance observed in their own Church sui iuris.
CCEO, Can. 1431 Those punished with a minor excommunication are deprived of the reception of the Divine Eucharist.
Unless you can show me an infant who is excommunicated or in a state of public sin, the Roman Catholic priest’s canons require him to commune a chrismated and communing Eastern Catholic child.