If this single is going to be a double-A-side single
then the tracklists could also be like this:
Moments 'Original Mix'
Memories 'Original Mix'
B-side track
Moments -instrumental-
Memories -instrumental-
But if one of those tracks -either Moments or Memories- is actually a B-side track
then the other one might also be a remix -either a dance remix or an acoustic one.
Btw, thanks for the informations!