Not the deck chassis. The tape chassis. The HDCam and DBC chassis are more sturdy, but essentially the same physical shape and size.
Here’s a Digibeta:
Here’s a consumer Beta L750:
My only point was the physical similarity of the tape chassis themselves, even though the underlying technology differs greatly from generation to generation. I remember that BetaCamSP tapes fit perfectly well into Digibeta decks, though not vice versa. I imagine one might be able to stuff any of those into an old Betamax consumer deck, but you wouldn’t be able to play or record. Never tried, myself. The HDCam and Digibeta tape stock is kinda spendy.