"It uses the same reel for both 35mm and 120, as far as I can see -- the 120 module is just the loader portion. That means the reel plates are the same, long enough for 135-36, which makes them also long enough for 220."
The 35mm and 120 reels for the Lab Box are entirely different, so you cannot assume that the 120 reel will accept the same length of film as a 36 exp 35mm film. The two reels do use the same center spindle, which has been a source of much issue for LB users, but that is a different subject. In other words, the reel is not a single unit, the width of which can be adjusted to fit 35mm or 120 film, like Paterson and some others.