Not entirely... Depending upon the types of "timestamp", "data", "index", and "previousHash", the value, "timestamp+data+index+previousHash", may be interprete

Not entirely... Depending upon the types of "timestamp", "data", "index", and "previousHash", the value, "timestamp+data+index+previousHash", may be interpreted as a number or a string, affecting the final hash. Splitting it up prevents this uncertainty.