I kind of have to ask the same thing - what do you think is different? Also, if the video was intended to have audio, I couldn't hear it at all - turned up full volume on my computer.
She is moving about too much, which makes assessing anything with breathing next to impossible. Have you checked her when she is at full rest, preferably sleeping?
How old is she and what else, if anything, is going on?
I don't know, she isn't actually relaxed in that second video either. But, the yawning, if it is the same thing for cats as it can be for humans, might mean she is trying to 'collect' additional oxygen. Not necessarily a medical condition per se, but I'd say given her age, and this is something you find to be out of the usual for her, send the vet those videos (assuming they accept them) and schedule an appointment for her to be checked out. It can't hurt, especially if she has not been in to see a vet recently.
Tell them everything else you've noticed about her, e.g., sleeping more, eating less, moving about less, acting lethargic, etc. All of those things can help to determine if there is anything going on.