2.9x vs 3.x scripting host difference list

does exist description difference between 2.9 and 3.x - I am still dealing with that. Have written working scripts for 2.9 ane cant get it run on 3.13 ? I cant find scripting host documentation for 3.x at the support/documentation of Mikrotik webiste.
Thank in advance

Here is the complete scripting guide for v3.x
http://wiki.mikrotik.com/wiki/Scripting