What are the differences between Dreamweaver_14_LS20.dmg and Dreamweaver_13_LS20.dmg?
Dreamweaver CC came in two major versions: the initial CC release (v13) and the CC 2014 release (v14). From the file names, you can infer which is which.

As for a "full installer", there is no such animal now. You install CC apps individually through the Creative Cloud Manager which downloads and installs the selected app(s).