Differences between X and X Eternal Calm & X2 and X2 Last Mission

[Marc]

When you open Final Fantasy X/X-2 HD Remaster, you have four options to choose from to play:

• Final Fantasy X
• Final Fantasy X Eternal Calm
• Final Fantasy X 2
• Final Fantasy X 2 Last Mission

What I want to know is, what's the difference (without spoilers) between Final Fantasy X and Final Fantasy X Eternal Calm, and Final Fantasy X 2 and Final Fantasy X 2 Last Mission?

 

[28142]

So, X Eternal Calm is a sorta film which serves as the sequal to X and the prequal to X-2. X-2 Last mission is a playable mini sequal to X-2.