Both tracks are really quite similar, its just the past version has the constant beat.
Should I start the song as Past and at the end (without reapeat) blend into present, or are the two tracks to similar?
I would say name the piece "Lanayru Sand Sea", since the tracks don't have any important differences.
Some points I would like to point out:
-Can you remove the "fit measures" thing at page 2? It makes look the sheet a bit bad.
-Could you also sustain the left hand chords in bar 1-16? It sounds somewhat empty without it.
-Koji Kondo only composed a few tracks for this game, and that doesn't include this one.