In the first video, condensation of water vapour from the engine exhaust is clearly visible probably due to colder air outside. Also, it is illuminated by the sun and stands out agains the cloud background:
In the second video, condensation is less apparent but is still visible:
Inconclusive, your did not film in the same angle for both. In the bottom one, we don't see the wing and more the ground, so you are filming down compared to the top video.
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