I didn’t realize that there were textural issues in Luke 22:19,20 when I quoted it in the other thread. Googling, I found this from the NABRE:
Which will be given…do this in memory of me> : these words are omitted in some important Western text manuscripts and a few Syriac manuscripts. Other ancient text types, including the oldest papyrus manuscript of Luke dating from the late second or early third century, contain the longer reading presented here. The Lucan account of the words of institution of the Eucharist bears a close resemblance to the words of institution in the Pauline tradition (see 1 Cor 11:23–26)
Here is Luke:
καὶ δεξάμενος ποτήριον εὐχαριστήσας εἶπεν Λάβετε τοῦτο καὶ διαμερίσατε εἰς ἑαυτούς· λέγω γὰρ ὑμῖν, [ὅτι] οὐ μὴ πίω ἀπὸ τοῦ νῦν ἀπὸ τοῦ γενήματος τῆς ἀμπέλου ἕως οὗ ἡ βασιλεία τοῦ θεοῦ ἔλθῃ. καὶ λαβὼν ἄρτον εὐχαριστήσας ἔκλασεν καὶ ἔδωκεν αὐτοῖς λέγων Τοῦτό ἐστιν τὸ σῶμά μου > τὸ ὑπὲρ ὑμῶν διδόμενον· τοῦτο ποιεῖτε εἰς τὴν ἐμὴν ἀνάμνησιν. καὶ τὸ ποτήριον ὡσαύτως μετὰ τὸ δειπνῆσαι, λέγων Τοῦτο τὸ ποτήριον ἡ καινὴ διαθήκη ἐν τῷ αἵματί μου, τὸ ὑπὲρ ὑμῶν ἐκχυννόμενον.
If I’m reading the notes correctly in NA28, the bold section is cut by Bezae (our weirdest major manuscript) and Itala (that is, the majority of old Latin sources). A number of manuscripts have ὡσαύτως καὶ τὸ ποτήριον, including a number of unicals, the majority text, the Vulgate, and some Syrian texts. However, our earliest papyrus version has the text as printed, as well as Vaticanus and Sinaiticus. The NABRE translators probably know the apparatus better than me, but I don’t see any Syrian sources omitting this (in NA28).
Here is 1 Corinthians again:
ἔλαβεν ἄρτον καὶ εὐχαριστήσας ἔκλασεν καὶ εἶπεν Τοῦτό μού ἐστιν τὸ σῶμα τὸ ὑπὲρ ὑμῶν· τοῦτο ποιεῖτε εἰς τὴν ἐμὴν ἀνάμνησιν. ὡσαύτως καὶ τὸ ποτήριον μετὰ τὸ δειπνῆσαι, λέγων Τοῦτο τὸ ποτήριον ἡ καινὴ διαθήκη ἐστὶν ἐν τῷ ἐμῷ αἵματι·
It’s easy to see a marginal note creeping across from here to Luke, perhaps to fill in a too truncated original text. But it’s also easy to see a quotation in one direction or the other, either direct, or by way of the “words of institution” which seem to play an important part in every early liturgy.
Mark:
Καὶ ἐσθιόντων αὐτῶν λαβὼν ἄρτον εὐλογήσας ἔκλασεν καὶ ἔδωκεν αὐτοῖς καὶ εἶπεν Λάβετε, τοῦτό ἐστιν τὸ σῶμά μου. καὶ λαβὼν ποτήριον εὐχαριστήσας ἔδωκεν αὐτοῖς, καὶ ἔπιον ἐξ αὐτοῦ πάντες. καὶ εἶπεν αὐτοῖς Τοῦτό ἐστιν τὸ αἷμά μου τῆς διαθήκης τὸ ἐκχυννόμενον ὑπὲρ πολλῶν· ἀμὴν λέγω ὑμῖν ὅτι οὐκέτι οὐ μὴ πίω ἐκ τοῦ γενήματος τῆς ἀμπέλου ἕως τῆς ἡμέρας ἐκείνης ὅταν αὐτὸ πίνω καινὸν ἐν τῇ βασιλείᾳ τοῦ θεοῦ.
Matthew:
Ἐσθιόντων δὲ αὐτῶν λαβὼν ὁ Ἰησοῦς ἄρτον καὶ εὐλογήσας ἔκλασεν καὶ δοὺς τοῖς μαθηταῖς εἶπεν Λάβετε φάγετε, τοῦτό ἐστιν τὸ σῶμά μου. καὶ λαβὼν ποτήριον καὶ εὐχαριστήσας ἔδωκεν αὐτοῖς λέγων Πίετε ἐξ αὐτοῦ πάντες, τοῦτο γάρ ἐστιν τὸ αἷμά μου τῆς διαθήκης τὸ περὶ πολλῶν ἐκχυννόμενον εἰς ἄφεσιν ἁμαρτιῶν· λέγω δὲ ὑμῖν, οὐ μὴ πίω ἀπ’ ἄρτι ἐκ τούτου τοῦ γενήματος τῆς ἀμπέλου ἕως τῆς ἡμέρας ἐκείνης ὅταν αὐτὸ πίνω μεθ’ ὑμῶν καινὸν ἐν τῇ βασιλείᾳ τοῦ πατρός μου.
The parallel isn’t as exact as between 1 Corinthians and Luke, but you can notice that every element of the bold section in Luke is present in Matthew + Mark, and that the changes are the standard Lukean-style dressings that he tends to had when he is using Matthew + Mark. If Luke is using these as sources here, it makes sense that the bold section is original to Luke. And the majority of important manuscripts seem to support that it is.
However, the idea that the author of 1 Corinthians was aware of Luke seems impossible. What seems more probable is that the Luke author was aware of 1 Corinthians, and that the 1 Corinthians author was aware of some communion text that was entirely parallel with Mark/Matthew – or even of Mark or Matthew itself.