Similarities
John 6:38; 1 Thessalonians 4:16 … Both involve a journey down from Heaven. Heaven is a real place. Once He came down and went back up. He is going to come back down again.
John 1:14; Acts 1:9-11 … Both comings are literal bodily comings of Christ. Some people suggest the second won’t be bodily, but the Bible makes it pretty clear that it will be a physical return.
Luke 2:8-14; 2 Thessalonians 1:7 … Both involve the appearance of angels. Angels heralded His first coming, appearing to Zacheriah, Mary, Joseph, and shepherds. There will be another flurry of angelic activity when Jesus returns.
Matthew 2:9; Revelation 6:13-14 … Both affect the stars, the heavens. His appearance causes disruption of the normal patterns of the stars. The Magi followed a star that appeared to them and led them to baby Jesus. The stars will also be different when He comes again.
Differences
Matthew 2:13; Revelation 19:11-16 … In the first coming, God came as a vulnerable baby. But in His return, He will come as a full grown man, but not just any man; He will come as a warrior king.
Luke 2:15-17; Revelation 1:7 … Only a few saw Him in His first coming. The only witnesses besides Mary and Joseph were the animals and some shepherds. However, in His second coming, everyone will see Him.
John 1:10-11; Philippians 2:10-11 … At His first coming, He was largely rejected. The second coming will see Him universally acknowledged as Lord and all will bow to Him.
John 1:29; Revelation 5:5 … He was compared to a lamb in His first coming. He fulfilled that role perfectly. He was innocent and without blemish. He was sacrificed on the cross for all of our sins once and for all. However, His second coming will see Him be more like a lion. He is the king, the royal one. He will triumph. But that doesn’t mean He isn’t still the lamb too. He’s always been both, just each coming exemplifies one over the other.
John 5:22-26; 28-29 … In the first coming He came to raise the spiritually dead. He brought real, eternal life to all who accept Him. His second coming will see Him raise the physically dead. He’s already redeemed our souls and will also redeem our bodies.
Matthew 13:36-38; 38-43 … He came to plant disciples in the first coming. His second coming will be to harvest and weed. The weeds will be pulled up and burned, but the righteous will be harvested and will shine like stars.
John 10:9; Revelation 3:8; Luke 13:22-25 … His first coming opened the door to Heaven. Jesus is the only door to Heaven; He is the way. But on His second coming, He will close that door. That door is open right now and anyone may enter. There is coming a time when it will close.