NIS2011, NIS2012, or No Difference Now?

I bought and installed NIS2011.  Currently in the help/About it shows build 19.2.0.10 which seems to be the latest build when people refer to NIS2012.  My GUI matches screenshots given for NIS2012 - I don't scrutinize the UI closely very often, thankfully, so unless a change were really drastic I wouldn't notice.  I have Automatic Download of New Version turned off (want to make those choices for myself if possible).  Nowhere does it say 2011 or 2012.  So what I'm wondering is, are there still separate year-dated versions or is it all the same now and you just know how up-to-date you are by the build number?  If there are changes to the program for the 2012 version, could someone kindly point me to a page describing them?  Is there some easy way to tell which you have?

 

TIA  :smileyhappy: