.webm to .mp4 and still the same video id HOW🤔

In this video I'm highly suspect of a video format change from a .webm file to a .mp4 file

My Video Source:
Dave McVegan🍔 NEW UPLOAD 4K 24hr Sun 360º Camera, Nothing To See Here, Or Should I Say There
https://www.youtube.com/watch?v=GAdlxKjkGsE

Dave McKeegan Video Source:
360° Timelapse of capturing the 24hr Antarctic sun
https://www.youtube.com/watch?v=jliLRasB48U

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