We wish to reproduce results from a paper published in 2014 that used the m3.2xlargeinstance type.  If we run that today would it have the same specs? If not is there a way to find documentation on what the differences would be?  In particular:RAM differencesnetworking speed differencescpu differences e.g. faster core i7 cpu's..Changes to disk types (ssd vs sata) and  access times 
Does Amazon change the specs of a given AWS machine instance type over time?
amazon ec2;amazon web services