Most of it. Any scene with Niellefresne, Ascilia, or Corguevais is in an Echo. The present day story is F'lhaminn trying to find a way to resurrect Niellefresne after he got killed in the final scene. Also, any non-7th Umbral Era scene outside of Futures Perfect that involves one of the Circle of Knowing members is in an Echo, too; the final cutscenes all involve Echoes within Echoes.
All three stories have parts in the present and past and characters whose names change. LL's has the most obvious one where Stahlmann, the former Commodore, is known as Rostnstahl in the present.
If you wanna watch all of them, look at this guy's channel:
https://www.youtube.com/user/KamuiSouZou/videos?view=1&flow=grid
Protip: every time you hear a "whoosh" sound, you've transitioned in or out of an Echo.