Super why pilot audio origin

With the super why pilot being found for a while I have a question about something that resurfaced before that pilot was found and that was audio of the pilot. The thing is that pilot audio doesn’t fully line up with the found pilot like with the score which is more whimsy in the audio but more reggae in the pilot and some different lines and sfx. But some elements are still the same like the voices and the plot. I just wonder where this audios source is as I wonder if it’s a different version of the pilot or something similar maybe even being from a different pilot as a 2nd pilot much closer to the final series exists

Audio: youtu.be/cBRdagUDh_U?si=nBhyjxpuI_Bxg21x
Video: youtu.be/fDa55riqASI?si=A4ufJbP-K6HhJ-p-