That's the funny thing about VIDEO GAMES and a FANTASY WORLD, especially when Square Enix has already proven it to make sense otherwise in their other FF MMORPG - Even when you compare real life, it's called Mutations and different species. Did you know? "In real life" there's hundreds if not thousands of species of spiders and mites and a 'Notorious' one could actually be a different specie thus look differently or was something enhanced through being alive from x era to today? Notice how in today, things evolved to be differently to adapt to the change world, what if the notorious monsters were simply alive for thousands of years and came out of hiding? They would look different than their cousins of 'today.' That's some of the lore they used in XI to explain why Bugards in Abyssea time line have more horns than bugards in our timeline.
I mean, obviously I can go into my local forest and run into Chimeras, right?
Yes, that's my point though...
They have the ability to make them look differently.
