Oh. My. God. *HEAD A SPLODES*
Kazmaka, the only reason Magus and Janus were both in Zeal was because of TIME TRAVEL! They are the same entity. The same individual. But from Past and Future.
Kid and Schala, even though they have identical Genes, have different souls. Different minds. They are two different people. Janus is fated to go through everything Magus did, and Magus remembers everything Janus ever went through
Kid and Schala, however, have two entirely different lives, and have nothing in common. Their personalities are different, their dialects are different, their histories are different, and so forth. It's like Dolly and Gracie. Dolly the sheep is a clone of Gracie the sheep. Dolly is considered a seperate entity however, has children of her own, died from a different genetic disease than Gracie, etc.