Not sure on the unintended capture of the lower one, but i have many, many of them. They are virtually found on almost every rock I examine and find visitors. Not all exact matches by any means though. With what I presume only to be facial features being consistent, then again, it may not have a face at all, looks can certainly be deceiving. Other parts like overall length and what protrudes along its sides has varied quite significantly. Nonetheless, its presence is almost a constant.