welcome to TFL
This is a yes and no thing.
Yes, in general since you are using the same parts, they should make the same marks. But "no" in specifics (possibly) because you are using a different slide, and the breechface of that slide does contact the cartridge case, and so could possibly leave a different mark than the Glock slide, or perhaps no mark at all.
SO, the important question is, "does this matter?"
And I mean does it matter in the legal sense in your country??
For that, you need qualified legal advice, to research and determine just how the laws and regulations of your country are written, interpreted, and enforced.
From what I'm reading, you need govt approval to get a different gun, and do not need that approval to just change a gun part, is that right?
And what you're wanting to know is if changing the part (and thereby changing the marks on the fired case) constitute a "different gun" under your legal system. To answer that, you need an expert in your legal system.
Ballistics means the study of objects in flight. Forensic means the application of the scientific method in criminal investigations. "Forensic Ballistics" is a made up term used as a blanket to cover a wider range of things than the words themselves mean.
"Ballistic fingerprint" is another made up term used by the media and
other underinformed people who think it means something that it does not.
The markings on a fired bullet, or shell casing ARE unique identifiers (if the inspection is detailed enought) HOWEVER, they are only valid identifiers of the gun at one point in time.
As the gun is used, parts wear. Things can change. Parts can be changed. Lots of things can change the marks, slightly. Normal wear from shooting is one of them.
SO, what is your legal status, if you have a gun which, when test fired no longer EXACTLY matches what the govt has on file, (taken when the gun was new??) Is that a criminal, or any kind of legal offense in your country??
In the US, its not. As long as the serial # part of the gun matches what the govt records say, to the govt, it is the same gun. Your country could be different, and you need valid legal advice about that from someone in your country.
Good Luck!