The original NES/SNES games are typically harder than all later releases

The first 2 NES games are also extremely bugg y

In 2, there's tons of spells that either don't work, or you'd have to cast literally 100s of times USELESSLY before they become useful

4 US release is easier than original Japanese release

No because the small screen and resolution isn't suitable for integer scaling 240p content and CRT shaders

>>712788946
I finished FF1-4 recently on emulator (Retroarch bsnes) with CRT shader

The NES games are WAY more difficult and buggy than modern ports

Difficult in a bad way, and buggy in a way that a lot of stuff doesn't even work (FF2 especially, insanely buggy, lots of spells don't work)

The SNES games you should have no problem with though.