Watch unaired pilot
I downloaded a DVD version back in Feb. It was 25m, this is 36m.
Not on YouTube: https://www.dailymotion.com/video/x7qgit3
That video on Dailymotion doesn't add any additional footage; it just repeats footage. People who post copyrighted videos do stuff like that to confuse take-down bots or something.
shareThe differences between the unaired version and Episode One are said to be very subtle. This article describes some of it:
https://www.digitalspy.com/tv/cult/a611634/doctor-whos-unaired-pilot-revisited-51-years-on/
I have no way to watch the two side-by-side, so I can't verify any of this.