In that link there is this adnotation on p.6: Jeśli zaś zechcą, śpiewa się hymn św. Ambrożego, biskupa Mediolanu – patrz s. .
The Te Deum is attributed to St.Ambrose, so I think it may the same hymn that Roman Catholics sing in the Divine Office each Sunday and Holy Day outside of Lent. In Poland, we also sing this on Easter, parish feast days and before Eucharistic processions after Communion.
On the Russian and Ukrainian wikipedias the versions of the Te Deum are side by side. So it seems that this is the same hymn that we Roman Catholics sing.