Project planning and scheduling processes follow a management framework called the Project Implementation Model (PIM). Such model divides the project into sub-boundaries called stages, gates, or checkpoints.

Does not really matter what proprietary term they call it. Company Y can call it Y-PIM (Company Y Implementation Model). Construction firm ABC might call theirs ABC-PIM.

Company ABC can call it any name because the name will not affect the framework’s gated process effectiveness.