As an aside, it is amazing to me how the RCC defends so vociferously the idea that it is the SAME OLD BODY made new in the case of each individual, but absolutely will not extend the very same to the earth and all of creation.
As to the argument here, it is a distinction without a difference - Even if it is the same old body, with each individual atom lovingly reconstructed, there is enough evidence (as already given) that the changes included in that reconstruction are broad enough to proclaim it 'new' as well, in the sense of re-modeling being something made new. I am willing to cede the point on that basis.
But in saying that, I would also point out that the example given, that Jesus was resurrected with the scars of His crucifixion still intact, is not the same image that we see in the Revelation of Jesus Christ, wherein His GLORIFIED self is somewhat grander than human (feet like brass, eyes like fire, and etc)... And if we are to be like Him (depending of course on how far 'like Him' is to be taken), then the 'new' is really a BIG 'new'.
Again, the effect and constitution of this 'new' body, the change we shall experience, IS NOT KNOWN. WE DON"T KNOW WHAT THAT IS... neither should we presume to know, beyond the knowledge that it is desirable to reach that change.
What seems to be tripping people up is that the body LOOKS the same, which is TOTALLY irrelevant.
The body has to be intrinsically different to be glorified like Jesus' body was, one that could appear and disappear in and out of our space/time continuum, one which could pass through walls and closed doors.
It makes not one iota of difference if it looks the same. It CAN'T be the same, not intrinsically.