If "bytecoin" was identical to Bitcoin, why would anyone stop using Bitcoin? They wouldn't. Bytecoin would be DOA.
"Fiat," when used to describe money, is the GOVERNMENT saying "let it be." From the first line of the Wikipedia article on Fiat Money (http://en.wikipedia.org/wiki/Fiat_money), "Fiat money is money that derives its value from government regulation or law." This does not describe Bitcoin.