Its the same. Vlabs offline can be used even if you are not connected to the internet
The basic difference in the online and offline versions is the look and feel.
In the offline version we see it as separate window. The window opens with the Default Lab set up. We can load all the lab set ups using the Load Homework options in the File menu.
Online version is HTML file. It opens directly in the browser. In the left panel select Resources by Type. All the lab set ups are arranged under various concepts.
Click on the drop down link and select the required lab set up.