Sankaku Channel/

Maybe somebody already asked this, but im too lazy to search it:
There is absolutely similiar images, for example
https://chan.sankakucomplex.com/post/show/4890584
https://chan.sankakucomplex.com/post/show/4890391
The only difference is size and source.
Which image i should flag?
The one with bigger filesize? Or the one what posted earlier?
And yeah, i know
>To make things easier for moderation staff please tag the duplicate post as a child of the higher quality post.