I know this is 6 days older than the "parent", therefore it was posted first, but both the parent and child are direct copies of each other, but it looks like the parent was stuck into an upscaler with 1x (therefore just a compression remover), which makes the child obsolete
what are danbooru's rules with duplicate posts I have no clue
while I'm here, if this was posted first shouldn't this be the parent by default? especially if the current proclaimed parent is just an edited version of the proclaimed child?
[edit] ok i did like 3 seconds of research, both links do infact link to the image posted, one on twitter, one on pixiv. Maybe I don't know how PNG to JPG conversion works, but I don't think colors get altered, such as it would if your upscaler mistakes it for something else.
im confused I don't know anymore. Does twitter not allowe PNG's? otherwise why would the original person post both a jpg version and a png version, when you could just post the png twice?