Hello,
TH2 ISOs are also known as 10586.0 or build 1511. But in fact they are all the same ISO provided by MS on November 2015. To be sure you may try to check the SHA1 or SHA2 values provided on the MS website.
So, if you find a 10586.xxx build this means that the build has been updated with monthly updates. ".xxx" number depends on the integrated cumulative update, the higher the number is ... the more recent your ISO is : for example with May 2016 the build is = 10586.318.