In Luke 21, Jesus was speaking when He was in the temple complex on the temple mount (we know from verses 1-3). So speaking at the temple complex was first. Then at the Mt of Olives after He and the disciples left the temple.Since you think the two passages are not parallel do me a favor and show me exactly when you think He said what is recorded in Luke 21:20-24 compared to when He said what is recorded in Matthew 24:15-22. Which do you think He said first and how long after do you think He said the other?
Here is how we know....
Matthew 24:
1 And Jesus went out, and departed from the temple: and his disciples came to him for to shew him the buildings of the temple.
2 And Jesus said unto them, See ye not all these things? verily I say unto you, There shall not be left here one stone upon another, that shall not be thrown down.
3 And as he sat upon the mount of Olives, the disciples came unto him privately, saying, Tell us, when shall these things be? and what shall be the sign of thy coming, and of the end of the world?
In Matthew 24:3-51, Jesus was speaking when He was on the Mt. of Olives.
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Luke 21:20-24 (70 AD) is not parallel to Matthew 24:15-22 (end times) because Daniel wrote about the abomination of desolation in Daniel 12 as being time of the end. Daniel 12:4, Daniel 12:9
The 1290 days of Daniel 12:11 and the 1335 days of Daniel 12:12 are still future. Do you agree ?