From the 1st recording, everyone's ping is the same area except for Snac. User missed shots. Usually for OC, the user's movement is faster and receiving less damage therefore. From my perspective, the user has some good aim shots but does miss a lot and she dies quite often. There was one weird round where user was tumbling and killed Snac but it was probably lucky pb shots. User does have some spikes during some rounds but it was not that noticeable.
In the second recording, there were no suspicious movements from her end. User did not have good aim and lost 2 rounds but beat you the last round from a lucky air pb when you fell into his crosshair.
I do not think this user is OCing.
I will wait for the other GM's opinion.