I'm not the definitive source of info on this, but I used the 2017 set last year. My office has a couple older books laying around, and a casual perusal appeared very similar. Also, going through the 2017 set, I saw a lot of info that was obviously old, with only minor revisions to make it current (like a reference to an old drug, only to say it's not used anymore).
I think the 2014 set will serve you well. There are 6 books in all, as I recall. If you don't have them all, maybe you can buy new versions of the sets you don't have. Make sure you read up on current guidelines, like ACC/AHA, ASRA coal, NRP, ACLS, etc.