LXX
Genesis 48:19 - καὶ οὐκ ἠθέλησεν ἀλλὰ εἶπεν οἶδα τέκνον οἶδα καὶ οὗτος ἔσται εἰς λαόν καὶ οὗτος ὑψωθήσεται ἀλλὰ ὁ ἀδελφὸς αὐτοῦ ὁ νεώτερος μείζων αὐτοῦ ἔσται καὶ τὸ σπέρμα αὐτοῦ ἔσται εἰς πλῆθος ἐθνῶν
Ethnon - nation / people - nationalities
G: 4128. pléthos - a great number - From pléthó (to be full)
Received Text
Romans 11:25 Οὐ γὰρ θέλω ὑμᾶς ἀγνοεῖν ἀδελφοί τὸ μυστήριον τοῦτο ἵνα μὴ ἦτεπαρ᾽ ἑαυτοῖς φρόνιμοι ὅτι πώρωσις ἀπὸ μέρους τῷ Ἰσραὴλ γέγονεν ἄχρις οὗτὸ πλήρωμα τῶν ἐθνῶν εἰσέλθῃ
G: 4138: pléróma -- fullness
No offense intended, and this post is more to all than just to you...
It will take more than a mere two words, let alone, two passages to prove your assertion that those two passages refer to one another.
What you are asserting is a Doctrine.
Meaning, a word or two, or tense or two, or what have you, is not going to cut it; is not going to prove this doctrine you are asserting.
For any doctrine is based on far much more than any one word, phrase, and or passage, or two.
Case in point, how the Lord proved Who He was to the Twelve - even AFTER His Resurrection...
Luke 24:19 And he said unto them, What things? And they said unto him, Concerning Jesus of Nazareth, which was a prophet mighty in deed and word before God and all the people: 24:20 And how the chief priests and our rulers delivered him to be condemned to death, and have crucified him. 24:21 But we trusted that it had been he which should have redeemed Israel: and beside all this, to day is the third day since these things were done.
A Doctrine: per the Spirit speaking through the father of John the Baptist in Luke 1:67-75; those two men had rightly believed Jesus would be delivering Israel from bondage under that foreign power that Israel had then under: the Mighty Roman Empire (Dan. 2:44; Dan. 12:1; Mark 1: 15, etc).
But they had gotten its timing wrong.
Luke 24:25 Then he said unto them, O fools, and slow of heart to believe all that the prophets have spoken: 24:26 Ought not Christ to have suffered these things, and to enter into his glory? 24:27 And beginning at Moses and all the prophets, he expounded unto them in all the scriptures the things concerning himself.
Note: Acts 3 relates His plans to return unto them towards His fulfillment of those Words related in Luke 1 - in accordance with their Law and the Prophets.
But anyway - the result of all those passages He rightly laid out to them in Luke 24?
24:31 And their eyes were opened, and they knew him; and he vanished out of their sight. 24:32 And they said one to another, Did not our heart burn within us, while he talked with us by the way, and while he opened to us the scriptures?
Another example...
Acts 17:1 Now when they had passed through Amphipolis and Apollonia, they came to Thessalonica, where was a synagogue of the Jews: 17:2 And Paul, as his manner was, went in unto them, and three sabbath days reasoned with them out of the scriptures, 17:3 Opening and alleging, that Christ must needs have suffered, and risen again from the dead; and that this Jesus, whom I preach unto you, is Christ.
And an example of what we are bound to run smack into, thus why, we'd best lay out more than some Greek tense or two...
Acts 17:11 These were more noble than those in Thessalonica, in that they received the word with all readiness of mind, and searched the scriptures daily, whether those things were so. 17:12 Therefore many of them believed; also of honourable women which were Greeks, and of men, not a few.
On other words...
Acts 17:11 These were more noble than those in Thessalonica, in that...
1 - they received the word with all readiness of mind, and...
2 - searched the scriptures daily, whether those things were so. 17:12...
3 - Therefore many of them believed; also of honourable women which were Greeks, and of men, not a few.
That three-fold principle being what we are each likely to run accross, in some.
Nevertheless, Rom. 14: 5 towards you - in memory of Rom. 5: 6-8 - in each our stead.