1Co 15:52 & 1 Thessalonians 4:16 are not the same event. One is the first coming of Christ and the other is the second coming of Christ.
1Co 15:51 Behold, I shew you a mystery; We shall not all sleep, but we shall all be changed,
1Co 15:52 In a moment, in the twinkling of an eye, at the last trump:
for the trumpet shall sound, and the
dead shall be raised incorruptible, and
we shall be changed.
1Co 15:53 For this corruptible must put on incorruption, and this mortal must put on immortality.
1Co 15:54 So when this corruptible shall have put on incorruption, and this mortal shall have put on immortality, then shall be brought to pass the saying that is written, Death is swallowed up in victory.
1) The trumpet shall sound - The last trump is the New Testament. Jesus' earthly ministry started the last trump.
2) The dead shall be raised incorruptible - Resurrection of the Old Testament saints, the first fruits.
3) We shall be changed - All alive put on the righteousness of Christ and everlasting life. Death was swallowed up in victory.
1st Corinthians is the first coming of Christ.
1Th 4:16 For the Lord himself shall descend from heaven with a shout, with the voice of the archangel, and
with the trump of God: and
the dead in Christ shall rise first:
1Th 4:17 Then we which are alive and remain shall be
caught up together with them in the clouds, to meet the Lord in the air: and so shall we ever be with the Lord.
1) With the trump of God - It doesn't say at the sounding of the trumpet, it says with the trump of God... he was holding it in his hand.
Rev 10:2 And he had in his hand a little book open: and he set his right foot upon the sea, and his left foot on the earth,
2) The dead in Christ shall rise first - The saints that have died from Christ to when he returns.
3) Caught up - The birth of the man child.
Rev 12:5 And she brought forth a man child, who was to rule all nations with a rod of iron: and her child was caught up unto God, and to his throne.
1 Thessalonians is the second coming of Christ... A body hast thou prepared me - the body of Christ, the man child.