Seeing how Spongebob can shape-shift to a certain degree, it would not be uncommon for him to transform into a body that would make his regular suit the size of pants.
Not to be "that guy" but different cultures and ages have slightly different skull structures which is how they determine a skeletons identity. *walks backward out the door*
I used to think the Greeks invented scientific methods as well but Sun Tzu in The Art of War literally told us that the Chinese did things in controlled environments; and he predated Pythagoras by over 400 years.