Is there a fixed total amount of Bitcoin cash?
Is this true with Bitcoin Cash?


Yes, the same.


  Is the only difference between Bitcoin Cash and the original bitcoin a larger block size?


There's one more difference: Bitcoin Cash uses BIP-143 to solve the quadratic hashing and to add replay protection. (BIP-143 is also enabled by SegWit on main chain.) (the formula is hashType | SIGHASH_FORKID (0x40) while it's hashType | SIGHASH_FORKID (0x40) | 79 &lt;&lt; 8 (20,024) on Bitcoin Gold)

As @jnewbery said, transactions are now being signed differently, and there's an emergency difficulty adjustment algorithm that makes difficulty lower by 20%, if the blocks come too slow. (More info about it here)



UPDATE November 13 A hardfork has occured. EDA was disabled and a new difficulty adjustment algorithm (cw-144) came. Also the 3rd person malleability (a.k.a. transaction malleability) is fixed. More info: https://www.bitcoinabc.org/november or https://github.com/bitcoincashorg/spec/blob/master/nov-13-hardfork-spec.md