The story is amazing and really different from what you normally expect, the art is good and to a great standard. I may sound a little strange but how are the numbers and letters different but the periodic table aren't different?
The periodic table is ordered by atomic number, meaning it's ordered by the amount of protons in the nucleus of the atom. I'd imagine every element no matter where it is in the universe will follow this same or a similar kind of order for elements.
