A body which has been glorified, made immortal and incorruptible, is a body which differs in nature to that of the glory of the natural and mortal corruptible body. IOW, it is changed from one type of body to another.
True, we do not know exactly what this body is going to be like but it will be the same sort of body Jesus rose in. Jesus said (Luke 24) that He was flesh and bone so I would say that our resurrection body would be flesh and bone. But that probably does not say much about the body.
If Jesus always had the divine nature, then his body (when born of Mary) would not have been subject to death (mortal). it would not have been a natural body. But that is false.
Jesus as a man on earth was more than His body. He did have a spirit also. The spirit comes from God and is our life but it is more than just a life force. For a start it knows our mind.
1Cor 2:10 But God has revealed it to us by the Spirit. The Spirit searches all things, even the deep things of God. 11
For who among men knows the thoughts of man except his own spirit within him? So too, no one knows the thoughts of God except the Spirit of God.
So anyway this means that Jesus could have had the nature of God even as a man. In fact that is what the scriptures say.
Phil 2:6 Who,
being in very nature God,
did not consider equality with God something to be used to his own advantage;
Here "being" is a present participle and I am told that means that Jesus not only had the divine nature, but kept it as a man.
When it's said that "in him dwells all the fullness of deity in bodily form" it refers to the Spirit of God dwelling in him....that is, in the natural mortal body.
It is in the present tense and so refers to Jesus now in whatever body He has.
Is the Spirit of God all the fullness of deity? Is the Holy Spirit God? I think so. But to be the fullness of deity the Holy Spirit has to have the Father. The Son has the Holy Spirit and the Father in Him.
Suppose God were to give me the ability to heal the sick. That would not change my nature as a mortal man. It would simply mean that God is working through me by giving me that ability. He is NOT adding a nature to me.
True and Jesus lived as a normal man also with a human nature and did not use His divine nature except that it is because of that nature that Jesus was able to resist sin.
Jesus however lived as a man and God gave Him the power to do the miracles.
Jesus is the Son of God His Father and so is exactly like Him in nature and so does not sin.
It is not the doing of miracles that adds a nature for Jesus, it is just that Jesus took on the nature of a servant when He became a man. He did not have the nature of a servant before this.
Phil 2:7 rather, he made himself nothing
by taking the very nature of a servant,
being made in human likeness.
This is when He stepped into creation imo (Col 1:15,16) and when His Father became His God (Psalm 22:10) in His mother's womb.
But Jesus certainly was not a created being if "all things" were created through Him.