As we all know, there have been numerous releases of FFIV. Apparently the original one released for the Super Famicom in Japan is the hardest version, and Final Fantasy II released in the US/Canada was made substantially easier. Later Final Fantasy IV was released as part of the "Final Fantasy Chronicles" on the PS1, and there have also been releases on the GBA and the Nintendo DS.

Anyhow, I simply want to know which version is the toughest. Is the Final Fantasy IV that was released as the part of the Final Fantasy Chronicles the same game difficulty wise as the original Super Famicom one?