Can you tell us what weapons were in Lau Bun's curriculum? It also begs the question if different weapons were ever swapped into a form, like Double Daggers with Butterfly Swords?
Lau Bun didn't teach in a cookie cutter fashion. He would give you forms that were suitable to you and only you. And yes, all weapons can be interchanged with each other.
Hung Sing Boyz, we gottit on lock down
when he's around quick to ground and pound a clown
Bruh we thought you knew better
when it comes to head huntin, ain't no one can do it better