Yes, there are a few differences, as the F40 is an updated version of the F30, differences include:
Cushion: The F40 has a shallower, lower-profile cushion that is softer and more flexible for enhanced comfort.
Headgear: The F40 has soft and flexible headgear available in three sizes—small, standard, and large—allowing for a more personalised fit. The mask includes the standard medium-sized headgear by default, but other sizes can be purchased separately if needed.
Exhalation Port: In the F40, the exhalation port has been relocated from the elbow to the cushion for a more streamlined design.
Frame Wings: The F40’s headgear now includes stability wings that offer more stretch, allowing for a custom fit.
Both masks are designed with comfort and simplicity in mind, and the choice between them depends entirely on personal preference. Neither mask is superior to the other.