I just saw a video today (it was also posted today) that showed a guy filming inside a store portraying him putting an S Pen for a Note 8 into the S Pen slot for a Note 9. Take note it didn’t go in all the way cause it had a cap at the end, but it slid in to the slot of the Note 9. It went in, giving the impression that it fit in there.
Here is the video: https://youtu.be/EeM2i1f_Lzs
Here is the video: https://youtu.be/EeM2i1f_Lzs