The wound is a deadly blow but not unto death for the beast will regain his strength and power.
Head wound - Kingdom taken away
Da 4:11 The tree grew, and was strong, and the height thereof reached unto heaven, and the sight thereof to the end of all the earth:
Da 4:14 He cried aloud, and said thus, Hew down the tree, and cut off his branches, shake off his leaves, and scatter his fruit: let the beasts get away from under it, and the fowls from his branches:
Wound healed - Kingdom restored
Da 4:36 At the same time my reason returned unto me; and for the glory of my kingdom, mine honour and brightness returned unto me; and my counsellors and my lords sought unto me; and I was established in my kingdom, and excellent majesty was added unto me.
This is indeed a parallel whereby we can understand the head wound in Rev 13. It is not a physical wound to a head attached to a body rather a blow to position and power. We see the description of Satan receiving such a blow described in two books, Dan 7 and Rev 12.
Satan is like a lion with eagle's wings. of course a counterfeit
Da 7:4 The first was like a lion, and had eagle's wings:
Here we see the wings plucked ie the head wound
Da 7:4 I beheld till the wings thereof were plucked,
Now we see the transformation from beast to man ie the wound healed
Da 7:4 and it was lifted up from the earth, and made stand upon the feet as a man, and a man's heart was given to it.
The dragon receive a head wound in battle and is cast out from heaven.
Re 12:7 And there was war in heaven: Michael and his angels fought against the dragon; and the dragon fought and his angels, Re 12:8 And prevailed not; neither was their place found any more in heaven.
The dragon is now upon the earth and of course no longer in spirit but restored as a man.
Re 12:13 And when the dragon saw that he was cast unto the earth, he persecuted the woman which brought forth the man child.
Re 12:17 And the dragon was wroth with the woman, and went to make war with the remnant of her seed, which keep the commandments of God, and have the testimony of Jesus Christ.
The Lion now becomes the Lamb. Of course counterfeit.
Re 13:5 And there was given unto him a mouth speaking great things and blasphemies; and power was given unto him to continue forty and two months. Re 13:7 And it was given unto him to make war with the saints, and to overcome them: and power was given him over all kindreds, and tongues, and nations.
Re 13:11 And I beheld another beast coming up out of the earth; and he had two horns like a lamb, and he spake as a dragon.
Da 7:8 I considered the horns, and, behold, there came up among them another little horn, before whom there were three of the first horns plucked up by the roots: and, behold, in this horn were eyes like the eyes of man, and a mouth speaking great things.