I want to use merge-with * to solve your problem. To do so, define a couple of 
helper functions 

   (defn v->m [v] (into (sorted-map) (for [{:keys [id val]} v] [id val])))
   (defn m->v [m] (mapv (fn [[k v]] {:id k :val v}) m))

that can convert your structure to and from sorted maps. With these, it boils 
down to a call to merge-with

   (m->v (merge-with * (v->m xs) (v->m ys)))

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