Paul states in I Corinthians 15:47 :
ο πρωτος ανθρωπος εκ γης χοικος ο δευτερος ανθρωπος ο κυριος εξ ουρανου
[TR - Beza, Stephens, Elzevir and Scrivener are all identical]
The first man is of the earth, earthy: the second man is the Lord from heaven.[KJV]
Paul uses εκ in describing the origin of the first humanity but then uses εξ in describing the origin of the second humanity.
What does Paul's choice of preposition tell us about these different origins ?
Edit Note : Thanks to the answer, it is clear that there is no difference in the preposition, which is informative, that 'out of the earth' and 'out of heaven' are both used to express Adam's origin and the origin of the second humanity.