Some Christians think that demons are not the same as fallen angels but are different from each other—distinct creatures. They got that idea from the Book of Enoch, an extra-biblical source not inspired by God. I will reveal with the Word of God that demons and fallen angels are indeed the same creatures. Only with a biblical view can you come out with demons being the same as fallen angels. You would need a different source to come out with something different.
14 One day Jesus was driving out a demon that was mute. And when the demon was gone, the man who had been mute spoke. The crowds were amazed, 15 but some of them said, “It is by Beelzebul, the prince of the demons, that He drives out demons.” 16 And others tested Him by demanding a sign from heaven. 17 Knowing their thoughts, Jesus said to them, “Every kingdom divided against itself will be laid waste, and a house divided against a house will fall. 18 If Satan is divided against himself, how can his kingdom stand? After all, you say that I drive out demons by Beelzebul. 19 And if I drive out demons by Beelzebul, by whom do your sons drive them out? So then, they will be your judges. 20 But if I drive out demons by the finger of God, then the kingdom of God has come upon you. -Luke 11:14-20 BSB
Beelzebul was a name given to Satan, as verse 18 connects Satan with Beelzebul. So, Satan is the prince and leader of the demons. If in Luke 11, Satan is the leader of the demonic spirits and in Revelation 12, see below, Satan, the dragon, is the leader of the [fallen] angels, it shows that demons and fallen angels are the same.
7 Then a war broke out in heaven: Michael and his angels fought against the dragon, and the dragon and his angels fought back. 8 But the dragon was not strong enough, and no longer was any place found in heaven for him and his angels. 9 And the great dragon was hurled down—that ancient serpent called the devil and Satan, the deceiver of the whole world. He was hurled to the earth, and his angels with him. -Revelation 12:7-9 BSB
We must never ever make extra-biblical sources the source of truth. If you do, you will be deceived.