No. It is not possible for Neopets to have copied Marapets as Neopets was around first. Neopets came into existence in 1997, Marapets came around in 2004.
Marapets has no passwords required, unlike Neopets.
Neopets, for sure is a website very close to Marapets.
Marapets
neopets
I think you should try neopets and marapets
Marapets
There's marapets
There are many sites, one of which is marapets but the site isn't as sophisticated as neopets i think.
Club Penguin Marapets Moshi Monsters
Neopets is good and marapets and club penguin
well i would go on mybe like petpetpark,neopets,marapets,or maybe panfu