It may just be that artist A is not familiar with artist's B work... also not hard to imagine 2 artists having similar ideas/artworks considering the strength of the Kellogg's Corn Flakes brand having been around for over 120 years
The original Coin Flakes from Max were a pretty niche' project when released in 2014/2015?
it could be an explanation, it's true.
However, the resemblance is really strong and I think that a minimum of initial research or "mention" wouldn't hurt.
let's ignore the fact that I don't think using the brand etc etc has authorization
I have seen some auction on scarce.city and probably one also here on forum. Nowadays is a well known piece...
...take Microsoul who literally copied Casascius design for his coins and people still bought.
perhaps for coins I see this problem less because the space is smaller and it is clear that certain information is always reported with the same type of design... like stamps.
If you take early stamp 900' they have always the same "design" more or less...