Hello there, was anyone able to convert a ghost file to a replay file in order to see on the replay viewer?

I want to check a ghost of a wr on a map, and I was able to download it cause I already identified the Trackmania API responsible for downloading the ghosts.
I know that the ghost file only have the movement of the car, so I pick a replay of mine on the same map and I want to swap the ghost part of that file with the ghost file, so I can see the ghost in the replay viewer.
I already decompress both the ghost and the replay file and I already identified the part on the replay file that needs to be swaped with the ghost file, but when I swap the game show a error, or crash, or open the map but cant play the replay.
What do I need to do? Cause I already read the documentation here but I also notice that this GBX file have more chunks that the documentation have (new game, so that's normal).
Have anyone in the older versions able to convert it, and if so how?