Thank you, I'm so glad you like them! <3
The difference between them is both sizing and a few details, mostly eyes. I've designed all creatures to work both on sideview and frontview, so on the sideview folder they look to the right, while on the frontview folder they look at the camera.
This is mostly just for convenience, as you can use them in whichever perspective you want!
If have any more questions or suggestions, I'm here! Have a great day.