Daijr, 新和英中辞典, ルミナス

Daijr, etc. separate them; GG5 has this in the 事による entry. I think they are different enough.

@@ -15,0 +15,1 @@
+<gloss>perhaps</gloss>

http://ejje.weblio.jp/content/ことによると

there's an entry for ことによる already, but i think the subtle difference in meaning here is worth its own entry.  i was confused at first trying to make sense of "depending on the circumstances/due to" + と in the context of what i was reading.