Oct 19, 2015 - 07:35 AM
Build 61297 is the highest version of TS12 for Steam and is pretty much equal to Hotfix 4 for a Non Steam English Version.
Build numbers signify when they were created not always that they are the latest version. So long as your Steam version is 3.7 you are up to date.
Steam versions do not always need the same patches as non Steam versions and can sometimes even be in advance of the Non Steam version.