Inconsequential. That both use Ὁ Λόγος is what is important
You're refusing to address the meaning of John 6:62 which is crystal clear. Jesus returned to where he was before.
Now this is the peculiar thing with unitarians. They make a big fuss over a pre-existent Ὁ Λόγοs but seem to allow Ὁ Λόγοs that afterwards went to heaven and exercised divine authority from their. If Ὁ Λόγοs could exercise divine authority in heaven post-sonship on earth, why couldn't Ὁ Λόγοs do the same before birth? To that unitarians have no convincing answer.
Here you're on the wrong ground. First the "person" analogy is always used for convenience by God to facilitate human interaction. For God is Spirit as is Ὁ Λόγοs. Spirit is not technically a "person" (the concept of a divine person is only of limited use) and the form of God is beyond human conception anyway. All we know about the form of God is that it is Spirit and it is "life" (John 6:63
). All we know about Ὁ Λόγοs in heaven is that it denotes "divine life." And so Ὁ Λόγοs isn't going to be revealed as a "person" before his birth, because in truth he isn't one: he is God (Jn 1:1c), which gives the true answer to your question.
It says he became flesh. I read that as Jesus' incorporeal parts (i.e. soul) came from a "kenosified" Λόγοs.