So I just beat REmake and something interesting to note is that after you beat it, if you start another play through you have the difficulty options of Easy, Normal, and Hard. So they may not actually be making a new "easy" difficulty, but instead letting you use the one you unlock after beating the game without having to complete the game.
The other alternative is that the original "Mountain Climbing vs Hiking" is actually normal vs easy, as opposed to hard vs normal.
Either way, it looks like all 3 difficulties were in the original game by default.