I’ll try to answer the flow of questions as good as possible:
I took them myself from a video.
The source is not from your links.
The caps are 1:1 from that video, they are not blown up afterwards.
The marks are scratches, and nothing digitally added.

EDIT:
There was someone who got a 16mm print of Knick Knack.
AFAIK it is not scanned, yet.

Back in that time, I just had a 35mm print of the altered re-release.
https://originaltrilogy.com/topic/Info-and-Help-Wanted-Looking-into-preserving-a-16mm-print-of-Pixars-Knick-Knack/id/65510

That had changed since then… I got a true 35mm print of the old version.