Definitely if you know the depth of Ahsoka's story it will add weight to her showing up in Mandalorian. But it won't be necessary to understand she is a Jedi and here is a youngling.
I really hope they give us a subtle reaction from her to Vader dying, somehow some way. Ahsoka is also my favourite Star Wars character, to me she is the ultimate lawful good alignment in this universe.
Clone Wars spoiler: