Use the same component for similar topics as search results.

app/serializers/similar_topic_serializer.rb

@@ -0,0 +1,17 @@
+class SimilarTopicSerializer < ApplicationSerializer
+
+  has_one :topic, serializer: TopicListItemSerializer, embed: :ids
+  attributes :id, :blurb, :created_at
+
+  def id
+    object.topic.id
+  end
+
+  def blurb
+    object.blurb
+  end
+
+  def created_at
+    object.topic.created_at
+  end
+end