Does the device have to create negative pressure or does a constricted airway have the same effect? I'm no expert - but it seems to me that, so long as you're

Does the device have to create negative pressure or does a constricted airway have the same effect? I'm no expert - but it seems to me that, so long as you're able to breathing at same rate and resistance, a small negative pressure (ex. with a powered fan) would be aerodynamically equivalent to a constricted airway (ex. breathing through a tube). Is a powered device meaningfully different than just breathing through a boba straw or similar (would be much cheaper...)