Are these the same 2 trumpet blasts? In Matthew chapter 24 Jesus is describing his 2nd coming:


  For as lightning that comes from the east is visible even in the west,
  so will be the coming of the Son of Man. Wherever there is a carcass,
  there the vultures will gather.“Immediately after the distress of
  those days
  
  “‘the sun will be darkened,
      and the moon will not give its light; the stars will fall from the sky,
      and the heavenly bodies will be shaken.’ “Then will appear the sign of the Son of Man in heaven. And then all the peoples of the
  earth will mourn when they see the Son of Man coming on the clouds of
  heaven, with power and great glory. And he will send his angels with
  a loud trumpet call, and they will gather his elect from the four
  winds, from one end of the heavens to the other." *Matt. 24:27-31*


He says that a loud trumpet blast will be sounded as his angels are sent to gather his elect.

Later in the New Testament, we read St. Paul describing what seems to be the same event:


  According to the Lord’s word, we tell you that we who are still alive,
  who are left until the coming of the Lord, will certainly not precede
  those who have fallen asleep. For the Lord himself will come down
  from heaven, with a loud command, with the voice of the archangel and
  with the trumpet call of God, and the dead in Christ will rise first.
  1 Thess. 4:15-16


Are these 2 passages describing the same trumpet blast? It appears to me that they both include:


The appearance (or reappearance) of the Son of Man.
Active participation of God's angels.
A trumpet blast.


I'm particularly concerned with the trumpet, which would logically be the connecting hinge  of these two passages.

Also, please no dispensationalism...
Yes they are the same trumpet blast because during both Scriptures you have the second coming of Jesus and the resurrection. 

In Matthew 24


  the angels "will gather his elect from the four winds"


In 1 Thess 4:16-17


  the dead in Christ will rise first. Then we who are alive and remain
  shall be caught up together with them in the clouds to meet the Lord
  in the air. And thus we shall always be with the Lord.


May I also add it is the same as 1 Corinthians 15:51-52


  Behold, I tell you a mystery: We shall not all sleep, but we shall all
  be changed—  in a moment, in the twinkling of an eye, at the last
  trumpet. For the trumpet will sound, and the dead will be raised
  incorruptible, and we shall be changed.