How to Transfer data from two games in the same universe?

You will want to use, 'Datastores'.

http://wiki.roblox.com/index.php?title=Data_store

Datastores cannot store items such as bricks tools etc, it can only save String values, 'text'. But you can put your items that you need into the ServerStorage/Lighting in both game Places.

For example if you have tools in your backpack, it saves the names of all the tools and puts them in a table then saves it to the Datastore. Then when you go to the other place it loads the table, then finds each name of the tools, and then makes copys of them from ServerStorage/Lighting and puts them into your backpack.