You walk into a room in a strange house. There’s a pair of pants on the floor. You try them on. They fit. It’s purely coincidental.

No, you cannot rely upon all bullets of the same weight to shoot to the same zero. Even if the load prints the same 100yrd zero, it won’t print the same at 200yrds unless it shares the exact same velocity and exact same ballistic coefficient - which different bullets loaded in different ammunition typically do not share.